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ARRAY AVERAGE AND MEDIAN MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. PASSING ARGUMENTS TO CALLBACK FUNCTIONS What are closures? Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure ‘remembers’ the environment in which it was created. TWO WAYS TO EMPTY AN ARRAY list = assigns a reference to a new array to a variable, while any other references are unaffected. which means that references to the contents of the previous array are still kept in memory, leading to memory leaks. list.length = 0 deletes everything in the array, which does hit other references.. In other words, if you have two references to the same array (a = ; a2 = a;), and youFAT ARROW FUNCTIONS
Introduced as a new feature in ES6, fat arrow functions may come as a handy tool to write more code in fewer lines. The name comes from its syntax, =>, which is a ‘fat arrow’, as compared to a thin arrow ->.Some programmers might already know this type of function from different languages such as Haskell, as ‘lambda expressions’, or as ‘anonymous functions’. MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES Hack for old browsers. Mozilla suggest: So, if you want to simulate an ordered associative array in a cross-browser environment, you are forced to either use two separate arrays (one for the keys and the other for the values), or build an array of single-property objects,etc.
USE DESTRUCTURING IN FUNCTION PARAMETERS Argument Handling. With plain destructuring assignment, if the the input parameter can’t be matched with the function’s specified object arguments, all the unmatched arguments are undefined, so you need to add code that handles this properly: var sayHelloTimes = function( { name, surname }, times) { console.log(`Hello $ {name} ${surname}!
FLATTENING MULTIDIMENSIONAL ARRAYS IN JAVASCRIPT MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. DEDUPLICATE AN ARRAY MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATING IMMUTABLE OBJECTS IN NATIVE JAVASCRIPT Immutability in object means we don’t want our objects to change in any ways once we create them i.e make them read-only type. Let’s suppose we need to define a car Object and use its properties to perform operations throughout our entire project. We can’t allow modifying by mistake any data. const myTesla = { maxSpeed: 250,batteryLife
CREATE ARRAY SEQUENCE `` IN ONE LINE Brief explanation. A = new Array(N) returns an array with N holes (i.e.A = , but A = undefined for x in 0N-1). F = (val,index)=>index is simply function F (val, index) { return index; }; Array.from(A, F) returns an N-element array, whose index I gets the results of F(A, I), which is simply I. Result: . One More Thing. If you actually want the sequence [1, 2 ARRAY AVERAGE AND MEDIAN MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. TWO WAYS TO EMPTY AN ARRAY list = assigns a reference to a new array to a variable, while any other references are unaffected. which means that references to the contents of the previous array are still kept in memory, leading to memory leaks. list.length = 0 deletes everything in the array, which does hit other references.. In other words, if you have two references to the same array (a = ; a2 = a;), and youFAT ARROW FUNCTIONS
Introduced as a new feature in ES6, fat arrow functions may come as a handy tool to write more code in fewer lines. The name comes from its syntax, =>, which is a ‘fat arrow’, as compared to a thin arrow ->.Some programmers might already know this type of function from different languages such as Haskell, as ‘lambda expressions’, or as ‘anonymous functions’. PASSING ARGUMENTS TO CALLBACK FUNCTIONS What are closures? Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure ‘remembers’ the environment in which it was created. MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES Hack for old browsers. Mozilla suggest: So, if you want to simulate an ordered associative array in a cross-browser environment, you are forced to either use two separate arrays (one for the keys and the other for the values), or build an array of single-property objects,etc.
USE DESTRUCTURING IN FUNCTION PARAMETERS Argument Handling. With plain destructuring assignment, if the the input parameter can’t be matched with the function’s specified object arguments, all the unmatched arguments are undefined, so you need to add code that handles this properly: var sayHelloTimes = function( { name, surname }, times) { console.log(`Hello $ {name} ${surname}!
GET FILE EXTENSION
Zero-fill right shift operator (»>) will transform -1 to 4294967295 and -2 to 4294967294, here is one trick to insure the filename unchanged in those edge cases. String.prototype.slice () extracts file extension from the index that was calculated above. If the index is WRITING A SINGLE METHOD FOR ARRAYS AND A SINGLE ELEMENT Rather than writing separate methods to handle an array and a single element parameter, write your functions so they can handle both. This is similar to how some of jQuery’s functions work (css will modify everything matched by the selector).You just have to concat everything into an array first. TWO WAYS TO EMPTY AN ARRAY list = assigns a reference to a new array to a variable, while any other references are unaffected. which means that references to the contents of the previous array are still kept in memory, leading to memory leaks. list.length = 0 deletes everything in the array, which does hit other references.. In other words, if you have two references to the same array (a = ; a2 = a;), and you INSERT ITEM INSIDE AN ARRAY Inserting an item into an existing array. Inserting an item into an existing array is a daily common task. You can add elements to the end of an array using push, to the beginning using unshift, or to the middle using splice. RETURN VALUES WITH THE 'NEW' OPERATOR The new operator in JavaScript is an operator that, under reasonable circumstances, returns a new instance of an object. Let’s say we have a constructor function: Note: this refers to the new object created by new. Otherwise if Thing () is called without new, no object is created, and this is going to point to the global object, which iswindow.
MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES Hack for old browsers. Mozilla suggest: So, if you want to simulate an ordered associative array in a cross-browser environment, you are forced to either use two separate arrays (one for the keys and the other for the values), or build an array of single-property objects,etc.
WHAT IS THE JAVASCRIPT TERNARY OPERATOR? The ternary operator is a shortcut for the if statement. It consists of three operands; a question mark, a condition, and an expression to execute if the condition is true, followed by a colon and another expression to execute if it’s false.ES6, VAR VS LET
NO, let is the new block scoping var. That statement emphasizes that let should replace var only when var was already signaling block scoping stylistically. Otherwise, leave var alone. let improves scoping options in JS, not replaces. var is still a useful signal USE DESTRUCTURING IN FUNCTION PARAMETERS Argument Handling. With plain destructuring assignment, if the the input parameter can’t be matched with the function’s specified object arguments, all the unmatched arguments are undefined, so you need to add code that handles this properly: var sayHelloTimes = function( { name, surname }, times) { console.log(`Hello $ {name} ${surname}!
在 JAVASCRIPT 簡單取得 UNIX TIMESTAMP 在 JavaScript 簡單取得 unix timestamp. By @nmrony on Feb 26, 2016. 我們經常需要計算 unix 的 timestamp。. 有許多方式可以取得 timestamp。. 目前取得 unix timestamp 最簡單和快速的方式是:. const dateTime = Date.now(); const timestamp = Math.floor(dateTime / 1000); 或. const dateTime = newDate().getTime
FLATTENING MULTIDIMENSIONAL ARRAYS IN JAVASCRIPT MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATE ARRAY SEQUENCE `` IN ONE LINE Brief explanation. A = new Array(N) returns an array with N holes (i.e.A = , but A = undefined for x in 0N-1). F = (val,index)=>index is simply function F (val, index) { return index; }; Array.from(A, F) returns an N-element array, whose index I gets the results of F(A, I), which is simply I. Result: . One More Thing. If you actually want the sequence [1, 2 DEDUPLICATE AN ARRAY MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATING IMMUTABLE OBJECTS IN NATIVE JAVASCRIPT Immutability in object means we don’t want our objects to change in any ways once we create them i.e make them read-only type. Let’s suppose we need to define a car Object and use its properties to perform operations throughout our entire project. We can’t allow modifying by mistake any data. const myTesla = { maxSpeed: 250,batteryLife
ARRAY AVERAGE AND MEDIAN MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. PASSING ARGUMENTS TO CALLBACK FUNCTIONS What are closures? Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure ‘remembers’ the environment in which it was created. TWO WAYS TO EMPTY AN ARRAY list = assigns a reference to a new array to a variable, while any other references are unaffected. which means that references to the contents of the previous array are still kept in memory, leading to memory leaks. list.length = 0 deletes everything in the array, which does hit other references.. In other words, if you have two references to the same array (a = ; a2 = a;), and youFAT ARROW FUNCTIONS
Introduced as a new feature in ES6, fat arrow functions may come as a handy tool to write more code in fewer lines. The name comes from its syntax, =>, which is a ‘fat arrow’, as compared to a thin arrow ->.Some programmers might already know this type of function from different languages such as Haskell, as ‘lambda expressions’, or as ‘anonymous functions’. MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES Hack for old browsers. Mozilla suggest: So, if you want to simulate an ordered associative array in a cross-browser environment, you are forced to either use two separate arrays (one for the keys and the other for the values), or build an array of single-property objects,etc.
USE DESTRUCTURING IN FUNCTION PARAMETERS Argument Handling. With plain destructuring assignment, if the the input parameter can’t be matched with the function’s specified object arguments, all the unmatched arguments are undefined, so you need to add code that handles this properly: var sayHelloTimes = function( { name, surname }, times) { console.log(`Hello $ {name} ${surname}!
FLATTENING MULTIDIMENSIONAL ARRAYS IN JAVASCRIPT MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATE ARRAY SEQUENCE `` IN ONE LINE Brief explanation. A = new Array(N) returns an array with N holes (i.e.A = , but A = undefined for x in 0N-1). F = (val,index)=>index is simply function F (val, index) { return index; }; Array.from(A, F) returns an N-element array, whose index I gets the results of F(A, I), which is simply I. Result: . One More Thing. If you actually want the sequence [1, 2 DEDUPLICATE AN ARRAY MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATING IMMUTABLE OBJECTS IN NATIVE JAVASCRIPT Immutability in object means we don’t want our objects to change in any ways once we create them i.e make them read-only type. Let’s suppose we need to define a car Object and use its properties to perform operations throughout our entire project. We can’t allow modifying by mistake any data. const myTesla = { maxSpeed: 250,batteryLife
ARRAY AVERAGE AND MEDIAN MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. PASSING ARGUMENTS TO CALLBACK FUNCTIONS What are closures? Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure ‘remembers’ the environment in which it was created. TWO WAYS TO EMPTY AN ARRAY list = assigns a reference to a new array to a variable, while any other references are unaffected. which means that references to the contents of the previous array are still kept in memory, leading to memory leaks. list.length = 0 deletes everything in the array, which does hit other references.. In other words, if you have two references to the same array (a = ; a2 = a;), and youFAT ARROW FUNCTIONS
Introduced as a new feature in ES6, fat arrow functions may come as a handy tool to write more code in fewer lines. The name comes from its syntax, =>, which is a ‘fat arrow’, as compared to a thin arrow ->.Some programmers might already know this type of function from different languages such as Haskell, as ‘lambda expressions’, or as ‘anonymous functions’. MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES Hack for old browsers. Mozilla suggest: So, if you want to simulate an ordered associative array in a cross-browser environment, you are forced to either use two separate arrays (one for the keys and the other for the values), or build an array of single-property objects,etc.
USE DESTRUCTURING IN FUNCTION PARAMETERS Argument Handling. With plain destructuring assignment, if the the input parameter can’t be matched with the function’s specified object arguments, all the unmatched arguments are undefined, so you need to add code that handles this properly: var sayHelloTimes = function( { name, surname }, times) { console.log(`Hello $ {name} ${surname}!
GET FILE EXTENSION
Zero-fill right shift operator (»>) will transform -1 to 4294967295 and -2 to 4294967294, here is one trick to insure the filename unchanged in those edge cases. String.prototype.slice () extracts file extension from the index that was calculated above. If the index is WRITING A SINGLE METHOD FOR ARRAYS AND A SINGLE ELEMENT Rather than writing separate methods to handle an array and a single element parameter, write your functions so they can handle both. This is similar to how some of jQuery’s functions work (css will modify everything matched by the selector).You just have to concat everything into an array first. TWO WAYS TO EMPTY AN ARRAY list = assigns a reference to a new array to a variable, while any other references are unaffected. which means that references to the contents of the previous array are still kept in memory, leading to memory leaks. list.length = 0 deletes everything in the array, which does hit other references.. In other words, if you have two references to the same array (a = ; a2 = a;), and you INSERT ITEM INSIDE AN ARRAY Inserting an item into an existing array. Inserting an item into an existing array is a daily common task. You can add elements to the end of an array using push, to the beginning using unshift, or to the middle using splice. RETURN VALUES WITH THE 'NEW' OPERATOR The new operator in JavaScript is an operator that, under reasonable circumstances, returns a new instance of an object. Let’s say we have a constructor function: Note: this refers to the new object created by new. Otherwise if Thing () is called without new, no object is created, and this is going to point to the global object, which iswindow.
MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES Hack for old browsers. Mozilla suggest: So, if you want to simulate an ordered associative array in a cross-browser environment, you are forced to either use two separate arrays (one for the keys and the other for the values), or build an array of single-property objects,etc.
WHAT IS THE JAVASCRIPT TERNARY OPERATOR? The ternary operator is a shortcut for the if statement. It consists of three operands; a question mark, a condition, and an expression to execute if the condition is true, followed by a colon and another expression to execute if it’s false.ES6, VAR VS LET
NO, let is the new block scoping var. That statement emphasizes that let should replace var only when var was already signaling block scoping stylistically. Otherwise, leave var alone. let improves scoping options in JS, not replaces. var is still a useful signal USE DESTRUCTURING IN FUNCTION PARAMETERS Argument Handling. With plain destructuring assignment, if the the input parameter can’t be matched with the function’s specified object arguments, all the unmatched arguments are undefined, so you need to add code that handles this properly: var sayHelloTimes = function( { name, surname }, times) { console.log(`Hello $ {name} ${surname}!
在 JAVASCRIPT 簡單取得 UNIX TIMESTAMP 在 JavaScript 簡單取得 unix timestamp. By @nmrony on Feb 26, 2016. 我們經常需要計算 unix 的 timestamp。. 有許多方式可以取得 timestamp。. 目前取得 unix timestamp 最簡單和快速的方式是:. const dateTime = Date.now(); const timestamp = Math.floor(dateTime / 1000); 或. const dateTime = newDate().getTime
FLATTENING MULTIDIMENSIONAL ARRAYS IN JAVASCRIPT MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATE ARRAY SEQUENCE `` IN ONE LINE Brief explanation. A = new Array(N) returns an array with N holes (i.e.A = , but A = undefined for x in 0N-1). F = (val,index)=>index is simply function F (val, index) { return index; }; Array.from(A, F) returns an N-element array, whose index I gets the results of F(A, I), which is simply I. Result: . One More Thing. If you actually want the sequence [1, 2 DEDUPLICATE AN ARRAY MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATING IMMUTABLE OBJECTS IN NATIVE JAVASCRIPT Immutability in object means we don’t want our objects to change in any ways once we create them i.e make them read-only type. Let’s suppose we need to define a car Object and use its properties to perform operations throughout our entire project. We can’t allow modifying by mistake any data. const myTesla = { maxSpeed: 250,batteryLife
ARRAY AVERAGE AND MEDIAN MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. PASSING ARGUMENTS TO CALLBACK FUNCTIONS What are closures? Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure ‘remembers’ the environment in which it was created.FAT ARROW FUNCTIONS
Introduced as a new feature in ES6, fat arrow functions may come as a handy tool to write more code in fewer lines. The name comes from its syntax, =>, which is a ‘fat arrow’, as compared to a thin arrow ->.Some programmers might already know this type of function from different languages such as Haskell, as ‘lambda expressions’, or as ‘anonymous functions’. TWO WAYS TO EMPTY AN ARRAY list = assigns a reference to a new array to a variable, while any other references are unaffected. which means that references to the contents of the previous array are still kept in memory, leading to memory leaks. list.length = 0 deletes everything in the array, which does hit other references.. In other words, if you have two references to the same array (a = ; a2 = a;), and you MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES Hack for old browsers. Mozilla suggest: So, if you want to simulate an ordered associative array in a cross-browser environment, you are forced to either use two separate arrays (one for the keys and the other for the values), or build an array of single-property objects,etc.
USE DESTRUCTURING IN FUNCTION PARAMETERS Argument Handling. With plain destructuring assignment, if the the input parameter can’t be matched with the function’s specified object arguments, all the unmatched arguments are undefined, so you need to add code that handles this properly: var sayHelloTimes = function( { name, surname }, times) { console.log(`Hello $ {name} ${surname}!
FLATTENING MULTIDIMENSIONAL ARRAYS IN JAVASCRIPT MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATE ARRAY SEQUENCE `` IN ONE LINE Brief explanation. A = new Array(N) returns an array with N holes (i.e.A = , but A = undefined for x in 0N-1). F = (val,index)=>index is simply function F (val, index) { return index; }; Array.from(A, F) returns an N-element array, whose index I gets the results of F(A, I), which is simply I. Result: . One More Thing. If you actually want the sequence [1, 2 DEDUPLICATE AN ARRAY MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATING IMMUTABLE OBJECTS IN NATIVE JAVASCRIPT Immutability in object means we don’t want our objects to change in any ways once we create them i.e make them read-only type. Let’s suppose we need to define a car Object and use its properties to perform operations throughout our entire project. We can’t allow modifying by mistake any data. const myTesla = { maxSpeed: 250,batteryLife
ARRAY AVERAGE AND MEDIAN MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. PASSING ARGUMENTS TO CALLBACK FUNCTIONS What are closures? Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure ‘remembers’ the environment in which it was created. TWO WAYS TO EMPTY AN ARRAY list = assigns a reference to a new array to a variable, while any other references are unaffected. which means that references to the contents of the previous array are still kept in memory, leading to memory leaks. list.length = 0 deletes everything in the array, which does hit other references.. In other words, if you have two references to the same array (a = ; a2 = a;), and youFAT ARROW FUNCTIONS
Introduced as a new feature in ES6, fat arrow functions may come as a handy tool to write more code in fewer lines. The name comes from its syntax, =>, which is a ‘fat arrow’, as compared to a thin arrow ->.Some programmers might already know this type of function from different languages such as Haskell, as ‘lambda expressions’, or as ‘anonymous functions’. MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES Hack for old browsers. Mozilla suggest: So, if you want to simulate an ordered associative array in a cross-browser environment, you are forced to either use two separate arrays (one for the keys and the other for the values), or build an array of single-property objects,etc.
USE DESTRUCTURING IN FUNCTION PARAMETERS Argument Handling. With plain destructuring assignment, if the the input parameter can’t be matched with the function’s specified object arguments, all the unmatched arguments are undefined, so you need to add code that handles this properly: var sayHelloTimes = function( { name, surname }, times) { console.log(`Hello $ {name} ${surname}!
GET FILE EXTENSION
Zero-fill right shift operator (»>) will transform -1 to 4294967295 and -2 to 4294967294, here is one trick to insure the filename unchanged in those edge cases. String.prototype.slice () extracts file extension from the index that was calculated above. If the index is WRITING A SINGLE METHOD FOR ARRAYS AND A SINGLE ELEMENT Rather than writing separate methods to handle an array and a single element parameter, write your functions so they can handle both. This is similar to how some of jQuery’s functions work (css will modify everything matched by the selector).You just have to concat everything into an array first. TWO WAYS TO EMPTY AN ARRAY list = assigns a reference to a new array to a variable, while any other references are unaffected. which means that references to the contents of the previous array are still kept in memory, leading to memory leaks. list.length = 0 deletes everything in the array, which does hit other references.. In other words, if you have two references to the same array (a = ; a2 = a;), and you INSERT ITEM INSIDE AN ARRAY Inserting an item into an existing array. Inserting an item into an existing array is a daily common task. You can add elements to the end of an array using push, to the beginning using unshift, or to the middle using splice. RETURN VALUES WITH THE 'NEW' OPERATOR The new operator in JavaScript is an operator that, under reasonable circumstances, returns a new instance of an object. Let’s say we have a constructor function: Note: this refers to the new object created by new. Otherwise if Thing () is called without new, no object is created, and this is going to point to the global object, which iswindow.
MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES Hack for old browsers. Mozilla suggest: So, if you want to simulate an ordered associative array in a cross-browser environment, you are forced to either use two separate arrays (one for the keys and the other for the values), or build an array of single-property objects,etc.
WHAT IS THE JAVASCRIPT TERNARY OPERATOR? The ternary operator is a shortcut for the if statement. It consists of three operands; a question mark, a condition, and an expression to execute if the condition is true, followed by a colon and another expression to execute if it’s false.ES6, VAR VS LET
NO, let is the new block scoping var. That statement emphasizes that let should replace var only when var was already signaling block scoping stylistically. Otherwise, leave var alone. let improves scoping options in JS, not replaces. var is still a useful signal USE DESTRUCTURING IN FUNCTION PARAMETERS Argument Handling. With plain destructuring assignment, if the the input parameter can’t be matched with the function’s specified object arguments, all the unmatched arguments are undefined, so you need to add code that handles this properly: var sayHelloTimes = function( { name, surname }, times) { console.log(`Hello $ {name} ${surname}!
在 JAVASCRIPT 簡單取得 UNIX TIMESTAMP 在 JavaScript 簡單取得 unix timestamp. By @nmrony on Feb 26, 2016. 我們經常需要計算 unix 的 timestamp。. 有許多方式可以取得 timestamp。. 目前取得 unix timestamp 最簡單和快速的方式是:. const dateTime = Date.now(); const timestamp = Math.floor(dateTime / 1000); 或. const dateTime = newDate().getTime
FLATTENING MULTIDIMENSIONAL ARRAYS IN JAVASCRIPT MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATE ARRAY SEQUENCE `` IN ONE LINE Brief explanation. A = new Array(N) returns an array with N holes (i.e.A = , but A = undefined for x in 0N-1). F = (val,index)=>index is simply function F (val, index) { return index; }; Array.from(A, F) returns an N-element array, whose index I gets the results of F(A, I), which is simply I. Result: . One More Thing. If you actually want the sequence [1, 2 DEDUPLICATE AN ARRAY MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATING IMMUTABLE OBJECTS IN NATIVE JAVASCRIPT Immutability in object means we don’t want our objects to change in any ways once we create them i.e make them read-only type. Let’s suppose we need to define a car Object and use its properties to perform operations throughout our entire project. We can’t allow modifying by mistake any data. const myTesla = { maxSpeed: 250,batteryLife
ARRAY AVERAGE AND MEDIAN MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. PASSING ARGUMENTS TO CALLBACK FUNCTIONS What are closures? Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure ‘remembers’ the environment in which it was created.FAT ARROW FUNCTIONS
Introduced as a new feature in ES6, fat arrow functions may come as a handy tool to write more code in fewer lines. The name comes from its syntax, =>, which is a ‘fat arrow’, as compared to a thin arrow ->.Some programmers might already know this type of function from different languages such as Haskell, as ‘lambda expressions’, or as ‘anonymous functions’. TWO WAYS TO EMPTY AN ARRAY list = assigns a reference to a new array to a variable, while any other references are unaffected. which means that references to the contents of the previous array are still kept in memory, leading to memory leaks. list.length = 0 deletes everything in the array, which does hit other references.. In other words, if you have two references to the same array (a = ; a2 = a;), and you MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES Hack for old browsers. Mozilla suggest: So, if you want to simulate an ordered associative array in a cross-browser environment, you are forced to either use two separate arrays (one for the keys and the other for the values), or build an array of single-property objects,etc.
USE DESTRUCTURING IN FUNCTION PARAMETERS Argument Handling. With plain destructuring assignment, if the the input parameter can’t be matched with the function’s specified object arguments, all the unmatched arguments are undefined, so you need to add code that handles this properly: var sayHelloTimes = function( { name, surname }, times) { console.log(`Hello $ {name} ${surname}!
FLATTENING MULTIDIMENSIONAL ARRAYS IN JAVASCRIPT MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATE ARRAY SEQUENCE `` IN ONE LINE Brief explanation. A = new Array(N) returns an array with N holes (i.e.A = , but A = undefined for x in 0N-1). F = (val,index)=>index is simply function F (val, index) { return index; }; Array.from(A, F) returns an N-element array, whose index I gets the results of F(A, I), which is simply I. Result: . One More Thing. If you actually want the sequence [1, 2 DEDUPLICATE AN ARRAY MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. CREATING IMMUTABLE OBJECTS IN NATIVE JAVASCRIPT Immutability in object means we don’t want our objects to change in any ways once we create them i.e make them read-only type. Let’s suppose we need to define a car Object and use its properties to perform operations throughout our entire project. We can’t allow modifying by mistake any data. const myTesla = { maxSpeed: 250,batteryLife
ARRAY AVERAGE AND MEDIAN MEET THE NEW JSTIPS BOOK You no longer need 10+ years of experience to get your dream job.. Use the 100 answers in this short book to boost your confidence and skills to ace the interviews at your favorite companies like Twitter, Google and Netflix. PASSING ARGUMENTS TO CALLBACK FUNCTIONS What are closures? Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure ‘remembers’ the environment in which it was created.FAT ARROW FUNCTIONS
Introduced as a new feature in ES6, fat arrow functions may come as a handy tool to write more code in fewer lines. The name comes from its syntax, =>, which is a ‘fat arrow’, as compared to a thin arrow ->.Some programmers might already know this type of function from different languages such as Haskell, as ‘lambda expressions’, or as ‘anonymous functions’. TWO WAYS TO EMPTY AN ARRAY list = assigns a reference to a new array to a variable, while any other references are unaffected. which means that references to the contents of the previous array are still kept in memory, leading to memory leaks. list.length = 0 deletes everything in the array, which does hit other references.. In other words, if you have two references to the same array (a = ; a2 = a;), and you MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES Hack for old browsers. Mozilla suggest: So, if you want to simulate an ordered associative array in a cross-browser environment, you are forced to either use two separate arrays (one for the keys and the other for the values), or build an array of single-property objects,etc.
USE DESTRUCTURING IN FUNCTION PARAMETERS Argument Handling. With plain destructuring assignment, if the the input parameter can’t be matched with the function’s specified object arguments, all the unmatched arguments are undefined, so you need to add code that handles this properly: var sayHelloTimes = function( { name, surname }, times) { console.log(`Hello $ {name} ${surname}!
GET FILE EXTENSION
Zero-fill right shift operator (»>) will transform -1 to 4294967295 and -2 to 4294967294, here is one trick to insure the filename unchanged in those edge cases. String.prototype.slice () extracts file extension from the index that was calculated above. If the index is WRITING A SINGLE METHOD FOR ARRAYS AND A SINGLE ELEMENT Rather than writing separate methods to handle an array and a single element parameter, write your functions so they can handle both. This is similar to how some of jQuery’s functions work (css will modify everything matched by the selector).You just have to concat everything into an array first. TWO WAYS TO EMPTY AN ARRAY list = assigns a reference to a new array to a variable, while any other references are unaffected. which means that references to the contents of the previous array are still kept in memory, leading to memory leaks. list.length = 0 deletes everything in the array, which does hit other references.. In other words, if you have two references to the same array (a = ; a2 = a;), and you INSERT ITEM INSIDE AN ARRAY Inserting an item into an existing array. Inserting an item into an existing array is a daily common task. You can add elements to the end of an array using push, to the beginning using unshift, or to the middle using splice. RETURN VALUES WITH THE 'NEW' OPERATOR The new operator in JavaScript is an operator that, under reasonable circumstances, returns a new instance of an object. Let’s say we have a constructor function: Note: this refers to the new object created by new. Otherwise if Thing () is called without new, no object is created, and this is going to point to the global object, which iswindow.
MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES Hack for old browsers. Mozilla suggest: So, if you want to simulate an ordered associative array in a cross-browser environment, you are forced to either use two separate arrays (one for the keys and the other for the values), or build an array of single-property objects,etc.
WHAT IS THE JAVASCRIPT TERNARY OPERATOR? The ternary operator is a shortcut for the if statement. It consists of three operands; a question mark, a condition, and an expression to execute if the condition is true, followed by a colon and another expression to execute if it’s false.ES6, VAR VS LET
NO, let is the new block scoping var. That statement emphasizes that let should replace var only when var was already signaling block scoping stylistically. Otherwise, leave var alone. let improves scoping options in JS, not replaces. var is still a useful signal USE DESTRUCTURING IN FUNCTION PARAMETERS Argument Handling. With plain destructuring assignment, if the the input parameter can’t be matched with the function’s specified object arguments, all the unmatched arguments are undefined, so you need to add code that handles this properly: var sayHelloTimes = function( { name, surname }, times) { console.log(`Hello $ {name} ${surname}!
在 JAVASCRIPT 簡單取得 UNIX TIMESTAMP 在 JavaScript 簡單取得 unix timestamp. By @nmrony on Feb 26, 2016. 我們經常需要計算 unix 的 timestamp。. 有許多方式可以取得 timestamp。. 目前取得 unix timestamp 最簡單和快速的方式是:. const dateTime = Date.now(); const timestamp = Math.floor(dateTime / 1000); 或. const dateTime = newDate().getTime
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@loverajoel in javascript WHAT IS THE JAVASCRIPT TERNARY OPERATOR? The ternary operator is a shortcut for the if statement.Read More →
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@loverajoel in javascript WHAT IS THE PROMISE EXECUTOR? The method received as an argument for the promise.Read More →
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@loverajoel in javascript WHAT IS A VOID OPERATOR? The void operator returns an undefined value from an evaluatedexpression
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@loverajoel in javascript WHAT IS A SPREAD OPERATOR? The spread operator is a useful syntax for manipulating arrays andobjects.
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@loverajoel in javascript WHAT IS THE DIFFERENCE BETWEEN TARGET AND CURRENTTARGET IN THE EVENTCONTEXT?
target refers to the element that triggers an event. currentTarget to the element that the event listener is listening on.Read More →
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@loverajoel in javascript WHAT IS THE TEMPORAL DEAD ZONE? Temporal Dead Zone is a JavaScript behavior while using variables declared using let and const keywords.Read More →
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@loverajoel in javascript WHAT IS A CURRYING FUNCTION? A currying function is a function that takes multiple arguments and turns it into a sequence of functions having only one argument at atime.
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@loverajoel in javascript WHAT IS FUNCTIONAL INHERITANCE? Functional inheritance is the process of inheriting features by applying an augmenting function to an object instance.Read More →
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@loverajoel in javascript WHAT IS FUNCTIONAL INHERITANCE? Functional inheritance is the process of inheriting features by applying an augmenting function to an object instance.Read More →
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@loverajoel in javascript CREATING IMMUTABLE OBJECTS IN NATIVE JAVASCRIPT With the latest versions of JavaScript it’s possible to create immutable objects. I’ll walk you through how to do it in threedifferent ways.
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@bhaskarmelkani in javascript HASH MAPS WITHOUT SIDE EFFECTS Create hash maps(without side effects) using Object.create(null).Read More →
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@loverajoel in javascriptLOOPING OVER ARRAYS
There’s a few methods for looping over arrays in Javascript. We’ll start with the classical ones and move towards additions made to thestandard.
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@loverajoel in javascript IMMUTABLE STRUCTURES AND CLONING Object cloning is a tricky, full of edge-cases, endeavor. The reason is simple enough. Objects maintain internal state, and that is much abused. There are countless techniques, or better phrased, countless derivations of the same technique.Read More →
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@loverajoel in javascript CLOSURES INSIDE LOOPS Closure in a loop is an interesting topic and this is the tip to be amaster of it
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@loverajoel in react UPPING PERFORMANCE BY APPENDING/KEYING React uses a mechanism called RECONCILIATION for efficient renderingon update.
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@loverajoel in javascript IMPROVING YOUR ASYNC FUNCTIONS WITH WEBWORKERS JS runs in a single thread in the browser, this is the truth. In this tip I’ll show you how to unleash the full power of asynchronous processing with Web Workers.Read More →
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@loverajoel in javascript PROTOCOLS FOR THE BRAVE You might have heard about the old ways gaining hype recently, and we don’t mean praying to the gods of the north. Today we’re introducing a feature found in Clojure which allows you to define interfaces for your classes.Read More →
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@loverajoel in react ADVENTURERS GUIDE TO REACT (PART I) So you’ve heard of this _React_ thing, and you actually peeked at the docs, maybe even went through some of the pages. Then you suddenly came across mysterious runes that spelled somewhat along the lines of Webpack, Browserify, Yarn, Babel, NPM and yet…Read More →
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VUEJS, HOW VUEJS MAKES A COPY-UPDATE-REPLACE INSIDE THE DATA BINDING. In this tip, I will introduce an example to show you how it might conflict with other software.Read More →
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@loverajoel in javascript PICKING AND REJECTING OBJECT PROPERTIES Sometimes we need to whitelist certain attributes from an object, say we’ve got an array representation of a database table and we need to select just a few fields for some function.Read More →
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@loverajoel in react ENHANCING REACT COMPONENTS, COMPOSITION React is extremely flexible in terms of how you can structure your components, but this pattern will make your apps more efficient.Read More →
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@TarekAlQaddy in javascript WHY YOU SHOULD USE OBJECT.IS() IN EQUALITY COMPARISON A good solution for the looseness of equality comparisons injavascript
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@loverajoel in javascript RECURSION, ITERATION AND TAIL CALLS IN JS If you’ve been on the business for some time, you have, most likely, come across the definition of recursion, for which the factorial of a given number n! = n * n - 1 * ... * 1 is a standard example…Read More →
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@loverajoel in react STATE TO PROPS MAPS WITH MEMORY You’ve been building your React apps with a Redux store for quite a while, yet you feel awkward when your components update so often. You’ve crafted your state thoroughly, and your architecture is such that each component gets just what it needs from…Read More →
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@loverajoel in javascript TAPPING FOR QUICK DEBUGGING This little beastie here is tap. A really useful function for quick-debugging chains of function calls, anonymous functions and, actually, whatever you just want to print.Read More →
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@hassanhelfi in javascript3 ARRAY HACKS
Arrays are everywhere and with the new spread operators introduced in ECMAScript 6, you can do awesome things with them. In this post I will show you 3 useful tricks you can use when programming.Read More →
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@loverajoel in javascript WORKING WITH WEBSOCKET TIMEOUT A trick to control the timeoutRead More →
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@loverajoel in angular PREVENTING UNWANTED SCOPES CREATION IN ANGULARJS In this tip I am going to show how to pass data between scopes preventing unwanted scopes created by ng-repeat and ng-ifRead More →
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@loverajoel in javascript BINDING OBJECTS TO FUNCTIONS Understanding how to use Bind method with objects and functions inJavaScript
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@leandrosimoes in javascriptTHREE USEFUL HACKS
Three very useful and syntax sugar hacks to speed up your development.Read More →
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@richzw in javascriptES6, VAR VS LET
In this tip, I will introduce the block-scope difference between keyword var and let. Should I replace var by let? let’s take a lookRead More →
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@vamshisuram in javascript BREAKING OR CONTINUING LOOP IN FUNCTIONAL PROGRAMMING A common task for us is iterate over a list looking for a value or values, but we can’t return from inside a loop so we will have to iterate the whole array, even if the item we search is the first in…Read More →
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@bhaskarmelkani in javascript COMMA OPERATOR IN JS When placed in an expression, it evaluates every expression from left to right and returns the last one.Read More →
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@loverajoel in javascriptCOPY TO CLIPBOARD
This week I had to create a common “Copy to Clipboard” button, I’ve never created one before and I want to share how I made it.Read More →
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@jamet-julien in javascript CREATE AN EASY LOOP USING AN ARRAY Sometimes, we need to loop endlessly over an array of items, like a carousel of images or an audio playlist. Here’s how to take an array and give it “looping powers”Read More →
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@alphashuro in javascript HOW TO USE OPTIONAL ARGUMENTS IN FUNCTIONS (WITH OPTIONAL CALLBACK) You can make function arguments and callback optionalRead More →
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@richzw in javascriptGET FILE EXTENSION
How to get the file extension more efficiently?Read More →
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@Morklympious in javascript RETURN VALUES WITH THE 'NEW' OPERATOR Understand what gets returned when using new vs. not using new.Read More →
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@loverajoel in react STATE TO PROPS MAPS WITH MEMORY You’ve been building your React apps with a Redux store for quite a while, yet you feel awkward when your components update so often. You’ve crafted your state thoroughly, and your architecture is such that each component gets just what it needs from…Read More →
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@octopitus in javascript DOM EVENT LISTENING MADE EASY An elegant and easy way to handle DOM eventsRead More →
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@loverajoel in angular PREVENTING UNWANTED SCOPES CREATION IN ANGULARJS In this tip I am going to show how to pass data between scopes preventing unwanted scopes created by ng-repeat and ng-ifRead More →
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@zackhall in javascript HELPFUL CONSOLE LOGGING TRICKS Helpful logging techniques using coercion and conditonal breakpoints.Read More →
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@nmrony in javascript EASIEST WAY TO EXTRACT UNIX TIMESTAMP IN JS In Javascript you can easily get the unix timestampRead More →
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@darul75 in javascript HOW TO `REDUCE()` ARRAYS Some reminders about using reduce()Read More →
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@adaniloff in javascriptBASICS DECLARATIONS
Understand and work with declarations.Read More →
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@loverajoel in javascript DETECT DOCUMENT READY IN PURE JS The cross-browser way to check if the document has loaded in pureJavaScript
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@loverajoel in javascript CALCULATE THE MAX/MIN VALUE FROM AN ARRAY Ways to use the built-in functions Math.max() and Math.min() witharrays of numbers
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@bmkmanoj in javascript KNOW THE PASSING MECHANISM JavaScript technically only passes by value for both primitives and object (or reference) types. In case of reference types the reference value itself is passed by value.Read More →
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@dislick in javascript USE DESTRUCTURING IN FUNCTION PARAMETERS Did you know that you can use destructuring in function parameters?Read More →
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@emars in javascript PREVENTING UNAPPLY ATTACKS Freeze the builtin prototypes.Read More →
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@soyuka in javascript ARRAY AVERAGE AND MEDIAN Calculate the average and median from array valuesRead More →
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@vamshisuram in javascript USING JSON.STRINGIFY Create string from selected properties of JSON object.Read More →
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@mallowigi in javascript ADVANCED JAVASCRIPT PROPERTIES How to add private properties, getters and setters to objects.Read More →
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@loverajoel in javascript FLATTENING MULTIDIMENSIONAL ARRAYS IN JAVASCRIPT Three different solutions to merge multidimensional array into asingle array.
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@danillouz in javascript DEDUPLICATE AN ARRAY How to remove duplicate elements, of different data types, from anArray.
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@beyondns in javascript OBSERVE DOM CHANGES IN EXTENSIONS When you develop extensions to existent sites it’s not so easy to play with DOM ‘cause of modern dynamic javascript.Read More →
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@hsleonis in javascript ASSIGNMENT OPERATORS Assigning is very common. Sometimes typing becomes time consuming for us ‘Lazy programmers’. So, we can use some tricks to help us and make our code cleaner and simpler.Read More →
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@madmantalking in javascript IMPLEMENTING ASYNCHRONOUS LOOP You may run into problems while implementing asynchronous loops.Read More →
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@SarjuHansaliya in javascript CREATE ARRAY SEQUENCE `` IN ONE LINE Compact one-liners that generate ordinal sequence arraysRead More →
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@loverajoel in javascript MAP() TO THE RESCUE; ADDING ORDER TO OBJECT PROPERTIES An Object it is an unordered collection of properties… that means that if you are trying to save ordered data inside an Object, you have to review it because properties order in objects are not guaranteed.Read More →
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@berkana in javascript AVOID MODIFYING OR PASSING `ARGUMENTS` INTO OTHER FUNCTIONS — ITKILLS OPTIMIZATION
Within JavaScript functions, the variable name arguments lets you access all of the arguments passed to the function. arguments is an _array-like object_; arguments can be accessed using array notation, and it has the _length_ property, but it doesn’t have many of the…Read More →
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@hakhag in javascript CONVERTING TRUTHY/FALSY VALUES TO BOOLEAN Logical operators are a core part of JavaScript, here you can see a a way you always get a true or false no matter what was given to it.Read More →
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@hingsir in javascript SPEED UP RECURSIVE FUNCTIONS WITH MEMOIZATION Fibonacci sequence is very familiar to everybody. we can write the following function in 20 seconds.it works, but not efficient. it did lots of duplicate computing works, we can cache its previously computed results to speed it up.Read More →
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@bhaskarmelkani in javascript CURRYING VS PARTIAL APPLICATION Currying and partial application are two ways of transforming a function into another function with a generally smaller arity.Read More →
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@bhaskarmelkani in javascript SHORT CIRCUIT EVALUATION IN JS. Short-circuit evaluation says, the second argument is executed or evaluated only if the first argument does not suffice to determine the value of the expression, when the first argument of the AND && function evaluates to false, the overall value must be false,…Read More →
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@davegomez in javascript FILTERING AND SORTING A LIST OF STRINGS You may have a big list of names you need to filter in order to remove duplicates and sort them alphabetically.Read More →
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@rishantagarwal in javascript USING IMMEDIATELY INVOKED FUNCTION EXPRESSION Called as “Iffy” ( IIFE - immediately invoked function expression) is an anonymous function expression that is immediately invoked and has some important uses in Javascript.Read More →
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@bhaskarmelkani in javascript USE === INSTEAD OF == The == (or !=) operator performs an automatic type conversion if needed. The === (or !==) operator will not perform any conversion. It compares the value and the type, which could be considered faster(jsPref ) than ==.
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@sonnyt in javascript CONVERTING TO NUMBER FAST WAY Converting strings to numbers is extremely common. The easiest and fastest way to achieve that would be using the + operator.Read More →
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@microlv in javascript TWO WAYS TO EMPTY AN ARRAY In JavaScript when you want to empty an array, there are a lot ways, but this is the most performant.Read More →
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@0xmtn in javascriptSHUFFLE AN ARRAY
Fisher-Yates Shuffling it’s an algorithm to shuffle an array.Read More →
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@WakeskaterX in javascript RETURN OBJECTS TO ENABLE CHAINING OF FUNCTIONS When creating functions on an object in Object Oriented Javascript, returning the object in the function will enable you to chainfunctions together.
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@gogainda in javascript SAFE STRING CONCATENATION Suppose you have a couple of variables with unknown types and you want to concatenate them in a string. To be sure that the arithmetical operation is not be applied during concatenation, use concatRead More →
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@pklinger in javascript TRUNCATING THE FAST (BUT RISKY) WAY .~~X is usually a faster Math.trunc(X), but can also make your code donasty things.
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@odsdq in javascript NODE.JS - RUN A MODULE IF IT IS NOT `REQUIRED` In node, you can tell your program to do two different things depending on whether the code is run from require('./something.js') or node something.js. This is useful if you want to interact with one of your modules independently.Read More →
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@minhazav in javascript PASSING ARGUMENTS TO CALLBACK FUNCTIONS By default you cannot pass arguments to a callback function, but you can take advantage of the closure scope in Javascript to pass arguments to callback functions.Read More →
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@jhogoforbroke in javascript EVEN SIMPLER WAY OF USING `INDEXOF` AS A CONTAINS CLAUSE JavaScript by default does not have a contains method. And for checking existence of a substring in a string or an item in an arrayyou may do this.
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@pklinger in javascriptFAT ARROW FUNCTIONS
Introduced as a new feature in ES6, fat arrow functions may come as a handy tool to write more code in fewer linesRead More →
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@manmadareddy in javascript TIP TO MEASURE PERFORMANCE OF A JAVASCRIPT BLOCK For quickly measuring performance of a javascript block, we can use the console functions like console.time(label) and console.timeEnd(label)Read More →
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@Avraam Mavridis in javascript PSEUDOMANDATORY PARAMETERS IN ES6 FUNCTIONS In many programming languages the parameters of a function are by default mandatory and the developer has to explicitly define that a parameter is optional.Read More →
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@squizzleflip in javascriptHOISTING
Understanding hoisting will help you organize your function scope.Read More →
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@loverajoel in javascript CHECK IF A PROPERTY IS IN A OBJECT These are ways to check if a property is present in an object.Read More →
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@JakeRawr in javascriptTEMPLATE STRINGS
As of ES6, JS now has template strings as an alternative to the classic end quotes strings.Read More →
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@Tevko in javascript CONVERTING A NODE LIST TO AN ARRAY Here’s a quick, safe, and reusable way to convert a node list into an array of DOM elements.Read More →
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@nainslie in javascript USE STRICT AND GET LAZY Strict-mode JavaScript makes it easier for the developer to write “secure” JavaScript.Read More →
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@mattfxyz in javascript WRITING A SINGLE METHOD FOR ARRAYS AND A SINGLE ELEMENT Rather than writing separate methods to handle an array and a single element parameter, write your functions so they can handle both. This is similar to how some of jQuery’s functions work (css will modify everything matched by the selector).Read More →
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@loverajoel in javascript DIFFERENCES BETWEEN `UNDEFINED` AND `NULL` Understanding the differences between undefined and null.Read More →
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@loverajoel in javascript SORTING STRINGS WITH ACCENTED CHARACTERS Javascript has a native method SORT that allows sorting arrays. Doing a simple array.sort() will treat each array entry as a string and sort it alphabetically. But when you try order an array of non ASCII characters you will obtain a strange result….Read More →
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@AlbertoFuente in javascript IMPROVE NESTED CONDITIONALS How can we improve and make a more efficient nested if statement injavascript?
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@loverajoel in react KEYS IN CHILDREN COMPONENTS ARE IMPORTANT The key is an attribute that you must pass to all components created dynamically from an array. It’s a unique and constant id that React uses to identify each component in the DOM and to know whether it’s a different component or the…Read More →
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@loverajoel in angular ANGULARJS - `$DIGEST` VS `$APPLY` JavaScript modules and build steps are getting more numerous and complicated, but what about boilerplate in new frameworks?Read More →
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@loverajoel in javascript INSERT ITEM INSIDE AN ARRAY Inserting an item into an existing array is a daily common task. You can add elements to the end of an array using push, to the beginning using unshift, or to the middle using splice.Read More →
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