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CHANGING REACT ROUTE PROGRAMMATICALLY WITH REDUX-SAGA Changing React Route Programmatically with Redux-Saga. Sometimes in a web app you've got a workflow that calls for a route change after a user action. For example, suppose the user has to complete a form and click a button. The data is sent to the server via AJAX and then you'd like to redirect the user to a another page upon successful UNDERSTANDING JAVASCRIPT CLOSURES IN FOR LOOPSSEE MORE ONDECEMBERSOFT.COM
HAS REDUX-SAGA GOT YOU STUCK IN AN INFINITE LOOP? Building asynchronous web applications is complicated. React with Redux is not enough. You need something like Redux-Saga to complete the picture.. I can show you how. Sign up on my email list where I write about Redux-Saga and related web development topics. USING A TIMER IN A REACT COMPONENT Using a Timer in a React Component. Sometimes you might need to write a component that relies on time. Perhaps you need to change some state after a period of time. Or maybe you need to perform a change that repeats on a regular interval. Adding time-based changes to your React components is easy to perform in stateless functional components HOW TO WRITE UNIT TESTS FOR ASYNCHRONOUS REDUX THUNKS IN Step Five: Run, fix errors, and repeat. Saving your file will kick off a new test run if you've already got Jest running. Otherwise, bring up a terminal window. Press Ctrl backtick in VSCode (or Ctrl Shift backtick for a new terminal window) and run the tests. > npm run test. BACK TO BASICS: RUNNING PROMISES IN SERIAL WITH ARRAY.REDUCE() Back to Basics: Running Promises in Serial with Array.reduce() last updated: Mar 2nd, 2017 REDUX HERO PART 5: THE HERO IS TESTED (A FUN INTRODUCTION Most developers agree that automated software testing is an important practice. It proves that code is correct now and that it stays correct in the future as the code evolves. REDUX-THUNK VS. REDUX-SAGA TYPESCRIPT VS. C#: 'AS' KEYWORD TypeScript also has an as keyword -- but beware that it behaves differently than in C#! When you work with TypeScript, the as keyword is only telling the type checker to pretend something has a different type. You can think of the type annotations as a separate, meta layer on top of the actual code. All the type-checking information is REDUX-SAGA AND ABORTCONTROLLER FOR TRULY CANCELLABLE API CALLSSEE MOREON DECEMBERSOFT.COM
CHANGING REACT ROUTE PROGRAMMATICALLY WITH REDUX-SAGA Changing React Route Programmatically with Redux-Saga. Sometimes in a web app you've got a workflow that calls for a route change after a user action. For example, suppose the user has to complete a form and click a button. The data is sent to the server via AJAX and then you'd like to redirect the user to a another page upon successful UNDERSTANDING JAVASCRIPT CLOSURES IN FOR LOOPSSEE MORE ONDECEMBERSOFT.COM
HAS REDUX-SAGA GOT YOU STUCK IN AN INFINITE LOOP? Building asynchronous web applications is complicated. React with Redux is not enough. You need something like Redux-Saga to complete the picture.. I can show you how. Sign up on my email list where I write about Redux-Saga and related web development topics.DECEMBERSOFT INC.
Using a Layer of Abstraction for Testing Code that Depends on Time. Continuing with this month's theme, Time, I want to share a strategy I've used in the past when I've needed to write unit tests for logic that depends on time, timers, timeouts, etc. HOW TO TYPE A KEYED COLLECTION IN TYPESCRIPT How to Type a Keyed Collection in TypeScript. last updated: Oct 23rd,2020
REDUX-THUNK VS. REDUX-SAGA But not the same. Redux-Thunk and Redux-Saga differ in a few important ways. But, first, let's cover some background. Redux-thunk and Redux-saga are both middleware libraries for Redux. Redux middleware is code that intercepts actions coming into the store via the dispatch()
UNDERSTANDING JAVASCRIPT CLOSURES IN FOR LOOPS The key difference here is that the function we added is executing immediately. i.e. It's running inside the loop as opposed to after the loop has already completed. The closure is now closing over the parameter to our function, which is effectively fixed to the value it was called with rather than the future value of e. REDUX-SAGA AND ABORTCONTROLLER FOR TRULY CANCELLABLE API CALLS AbortController is an API that allows Fetch requests to be cancelled. It is available in Chrome 66, Firefox 57, Safari 11.1, Edge 16 (via caniuse.com ). You can add it to your saga like this. We create an instance of AbortController at the top of our saga. Notice we need to add a signal parameter to our API call. STARTING A REACT/REDUX PROJECT WITH TYPESCRIPT Some developers may choose Flux, MobX, other libraries, or even nothing but pure React. Install react-redux and its TypeScript definitions. npm install --save react-redux @types/react-redux. 8. Run a Test Window. Now you're ready to start playing with the code and learning React/Redux. REDUX HERO PART 1: A HERO IS BORN (A FUN INTRODUCTION TO Redux Hero Part 1: A Hero is Born (A Fun Introduction to Redux.js) last updated: Jul 14th, 2016 A SIMPLE NAMING CONVENTION FOR ACTION CREATORS IN REDUX.JS This snippet from the Redux documentation is the action creator for adding a todo to a list. let nextTodoId = 0 export const addTodo = (text) => { return { type: 'ADD_TODO', id: nextTodoId++, text } } In the context of the TodoMVC example application, the ADD_TODO action type and the addTodo () action creator are adequately named becausethe
WHAT IS THE RIGHT WAY TO DO ASYNCHRONOUS OPERATIONS IN REDUX? 1. Must be transpiled down to ES5 via Babel, TypeScript 2.3, etc. Conclusion. So what is the right way to do asynchronous operations in Redux? There really is no right answer for everyone. ERROR: SELECTOR CREATORS EXPECT ALL INPUT-SELECTORS TO BE Error: Selector creators expect all input-selectors to be functions, instead received the following types: Addressing this problem is a nightmare if you don't know what to look for. But lucky for you, I've dealt with this before. I admit I wrote the following code -- well, the names have been changed to protect theinnocent.
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* Using a Layer of Abstraction for Testing Code that Depends on Time * Code Review: Visualizing Bubble Sort in React * Using a Timer in a React Component * How to Type a Keyed Collection in TypeScript * How to Write Unit Tests for Asynchronous Redux Thunks in Five EasySteps
* Do you need React Hooks? * Why is this JavaScript so Slow? * Redux Hero Part 5: The Hero is Tested (a Fun Introduction to redux-saga-test-plan) * How to Level Up your React Skills * Redux-Saga and AbortController for Truly Cancellable API CallsRECENT ARTICLES
USING A LAYER OF ABSTRACTION FOR TESTING CODE THAT DEPENDS ON TIME Continuing with this month's theme, Time, I want to share a strategy I've used in the past when I've needed to write unit tests for logic that depends on time, timers, timeouts, etc. Take for example a cache where items can expire. Suppose you want items to be evicted once they have gone untouched for some period oftime.
One simple approach might be to take the idle expiry as a parameter. Say 20 minutes in a production build and only 100 milliseconds duringtesting.
Testing this way can lead to brittle tests. By brittle I mean that your tests will pass most of the time. But occasionally, if your machine is busy or the tests run on a different machine, it's possible that you'll get some false negatives. In addition, your tests will take longer to run than necessary. Here's what I do instead.Read more...
CODE REVIEW: VISUALIZING BUBBLE SORT IN REACT Last week I wrote about Using a Timer in a React Component but only gave a simple example. This week I'm going to review some code with more complexity. A question came up on Reddit recently where someone was having difficulty creating a visual bubble sort in React. The posted code has a few problems. Take a look to see if you can spot any.ORIGINAL CODE
bubbleSort() {    const arr = this.state.array;    const n = arr.length;    for (let i = n - 1; i > 0; i--) {        for (let j = 0; j < i; j++) {            setTimeout(() => {                if (arr > arr) {                    let temp = arr;                    arr = arr;                    arr = temp;                    this.setState({ swaps: this.state.swaps + 1 });                }                this.setState({ comparisons: this.state.comparisons + 1 });            }, i * 10);        }    }    this.setState({ array: arr });}Read more...
USING A TIMER IN A REACT COMPONENT Sometimes you might need to write a component that relies on time. Perhaps you need to change some state after a period of time. Or maybe you need to perform a change that repeats on a regular interval. Adding time-based changes to your React components is easy to perform in stateless functional components using a few React hooks. I'm goingto show you how.
Read more...
HOW TO TYPE A KEYED COLLECTION IN TYPESCRIPT I stumbled across a new type definition today -- at least it was new to me -- and I was so excited because I'd been using a less-than-perfect alternative for so long. Before I go on, I should clarify what I mean by a keyed collection. Different languages call it by different names. In JavaScript/TypeScript it's just an object since object is so versatile. (Okay, technically there is a Map in JavaScript too but it has a different interface). In C# it's called a Dictionary. Some people might call it a lookup or a map.Read more...
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