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RANDOM · AN INTRODUCTION TO ELM Random. So far we have only seen commands to make HTTP requests, but we can command other things as well, like generating random values! So we are going to make an app that rolls dice, producing a random numberbetween 1 and 6.
JSON · AN INTRODUCTION TO ELM import Browser import Html exposing (..) import Html.Attributes exposing (..) import Html.Events exposing (..) import Http import Json.Decode exposing (Decoder, fieldDOCS/STYLE-GUIDE
TIME · AN INTRODUCTION TO ELM Time. Now we are going to make a digital clock. (Analog will be an exercise!) So far we have focused on commands. With the HTTP and randomness examples, we commanded Elm to do specific work immediately, but that is sort of a weird pattern for a clock. STRUCTURE · AN INTRODUCTION TO ELM Folks coming from React expect everything to be components. Actively trying to make components is a recipe for disaster in Elm. The root issue is that components are objects: components = local state + methods. local state + methods = objects. MINIFICATION · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG TYPES AS SETS · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG HTML.LAZY · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies. CODE EDITOR · AN INTRODUCTION TO ELM Step 1: Download Sublime Text from here. Step 2: Install the "Elm Syntax Highlighting" plugin. Mac. Linux. Windows. After going through those steps, it should be possible to open Elm files with syntax highlighting. Keywords like import and type should be colorful so thecode is
RANDOM · AN INTRODUCTION TO ELM Random. So far we have only seen commands to make HTTP requests, but we can command other things as well, like generating random values! So we are going to make an app that rolls dice, producing a random numberbetween 1 and 6.
JSON · AN INTRODUCTION TO ELM import Browser import Html exposing (..) import Html.Attributes exposing (..) import Html.Events exposing (..) import Http import Json.Decode exposing (Decoder, fieldDOCS/STYLE-GUIDE
TIME · AN INTRODUCTION TO ELM Time. Now we are going to make a digital clock. (Analog will be an exercise!) So far we have focused on commands. With the HTTP and randomness examples, we commanded Elm to do specific work immediately, but that is sort of a weird pattern for a clock. STRUCTURE · AN INTRODUCTION TO ELM Folks coming from React expect everything to be components. Actively trying to make components is a recipe for disaster in Elm. The root issue is that components are objects: components = local state + methods. local state + methods = objects. MINIFICATION · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG TYPES AS SETS · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG HTML.LAZY · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORGTRY ELM!
Online Editor. Write and compile code online! Hello World! Buttons. Clock. Cat GIFs. Cards. More! Check out the official guide for atutorial on Elm.
NEWS - ELM
News. This page focuses on news about the compiler and core libraries. For more frequent news, check out these retweets and the community forums to hear about packages, tooling, editors, blogs, projects, etc.. Announcements. The Syntax Cliff; Towards a Homegrown ProgrammingLanguage
ELM · AN INTRODUCTION TO ELM Install Elm. The previous page described how to install a code editor for Elm, so the next step is to obtain an executable file named elm.Here are the install links:. Mac - installer; Linux - instructions; Windows - installer; After installation is complete, open up the terminal on your computer. COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies. STRUCTURE · AN INTRODUCTION TO ELM Folks coming from React expect everything to be components. Actively trying to make components is a recipe for disaster in Elm. The root issue is that components are objects: components = local state + methods. local state + methods = objects.DOCS/STYLE-GUIDE
Goal: a consistent style that is easy to read and produces clean diffs. This means trading aggressively compact code for regularity and ease of modification. Line Length. Keep it under 80 characters. Going over is not the end of the world, but consider refactoring before you decide a line really must be longer. CUSTOM TYPES · AN INTRODUCTION TO ELM Note: Custom types used to be referred to as “union types” in Elm. Names from other communities include tagged unions and ADTs.. Custom Types. So far we have seen a bunch of types like Bool, Int, and String.But how do we define our own? Say we are making a chat room. HTTP · AN INTRODUCTION TO ELM HTTP. It is often helpful to grab information from elsewhere on the internet. For example, say we want to load the full text of Public Opinion by Walter Lippmann. Published in 1922, this book provides a historical perspective on the rise of mass media and its implicationsfor democracy.
URL PARSING · AN INTRODUCTION TO ELM In this case we have individual blog posts and a blog overview with an optional query parameter. We need to add the Url.Parser.Query module to write our URL parser this time: import Url.Parser exposing (Parser, (), (), int, map, oneOf, s, string) import Url.Parser.Query as Query type Route = BlogPost Int String | BlogQuery (Maybe String TEXT FIELDS · AN INTRODUCTION TO ELM We know we have to keep track of whatever the user has typed into the text field. We need that information to know how to render the reversed text. So we go with this: type alias Model = { content : String } This time I chose to represent the model as a record. The record stores the user input in COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies. CODE EDITOR · AN INTRODUCTION TO ELM Step 1: Download Sublime Text from here. Step 2: Install the "Elm Syntax Highlighting" plugin. Mac. Linux. Windows. After going through those steps, it should be possible to open Elm files with syntax highlighting. Keywords like import and type should be colorful so thecode is
RANDOM · AN INTRODUCTION TO ELM Random. So far we have only seen commands to make HTTP requests, but we can command other things as well, like generating random values! So we are going to make an app that rolls dice, producing a random numberbetween 1 and 6.
JSON · AN INTRODUCTION TO ELM import Browser import Html exposing (..) import Html.Attributes exposing (..) import Html.Events exposing (..) import Http import Json.Decode exposing (Decoder, fieldDOCS/STYLE-GUIDE
TIME · AN INTRODUCTION TO ELM Time. Now we are going to make a digital clock. (Analog will be an exercise!) So far we have focused on commands. With the HTTP and randomness examples, we commanded Elm to do specific work immediately, but that is sort of a weird pattern for a clock. STRUCTURE · AN INTRODUCTION TO ELM Folks coming from React expect everything to be components. Actively trying to make components is a recipe for disaster in Elm. The root issue is that components are objects: components = local state + methods. local state + methods = objects. MINIFICATION · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG TYPES AS SETS · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG HTML.LAZY · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies. CODE EDITOR · AN INTRODUCTION TO ELM Step 1: Download Sublime Text from here. Step 2: Install the "Elm Syntax Highlighting" plugin. Mac. Linux. Windows. After going through those steps, it should be possible to open Elm files with syntax highlighting. Keywords like import and type should be colorful so thecode is
RANDOM · AN INTRODUCTION TO ELM Random. So far we have only seen commands to make HTTP requests, but we can command other things as well, like generating random values! So we are going to make an app that rolls dice, producing a random numberbetween 1 and 6.
JSON · AN INTRODUCTION TO ELM import Browser import Html exposing (..) import Html.Attributes exposing (..) import Html.Events exposing (..) import Http import Json.Decode exposing (Decoder, fieldDOCS/STYLE-GUIDE
TIME · AN INTRODUCTION TO ELM Time. Now we are going to make a digital clock. (Analog will be an exercise!) So far we have focused on commands. With the HTTP and randomness examples, we commanded Elm to do specific work immediately, but that is sort of a weird pattern for a clock. STRUCTURE · AN INTRODUCTION TO ELM Folks coming from React expect everything to be components. Actively trying to make components is a recipe for disaster in Elm. The root issue is that components are objects: components = local state + methods. local state + methods = objects. MINIFICATION · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG TYPES AS SETS · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG HTML.LAZY · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORGTRY ELM!
Online Editor. Write and compile code online! Hello World! Buttons. Clock. Cat GIFs. Cards. More! Check out the official guide for atutorial on Elm.
NEWS - ELM
News. This page focuses on news about the compiler and core libraries. For more frequent news, check out these retweets and the community forums to hear about packages, tooling, editors, blogs, projects, etc.. Announcements. The Syntax Cliff; Towards a Homegrown ProgrammingLanguage
ELM · AN INTRODUCTION TO ELM Install Elm. The previous page described how to install a code editor for Elm, so the next step is to obtain an executable file named elm.Here are the install links:. Mac - installer; Linux - instructions; Windows - installer; After installation is complete, open up the terminal on your computer. COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies. STRUCTURE · AN INTRODUCTION TO ELM Folks coming from React expect everything to be components. Actively trying to make components is a recipe for disaster in Elm. The root issue is that components are objects: components = local state + methods. local state + methods = objects.DOCS/STYLE-GUIDE
Goal: a consistent style that is easy to read and produces clean diffs. This means trading aggressively compact code for regularity and ease of modification. Line Length. Keep it under 80 characters. Going over is not the end of the world, but consider refactoring before you decide a line really must be longer. CUSTOM TYPES · AN INTRODUCTION TO ELM Note: Custom types used to be referred to as “union types” in Elm. Names from other communities include tagged unions and ADTs.. Custom Types. So far we have seen a bunch of types like Bool, Int, and String.But how do we define our own? Say we are making a chat room. HTTP · AN INTRODUCTION TO ELM HTTP. It is often helpful to grab information from elsewhere on the internet. For example, say we want to load the full text of Public Opinion by Walter Lippmann. Published in 1922, this book provides a historical perspective on the rise of mass media and its implicationsfor democracy.
URL PARSING · AN INTRODUCTION TO ELM In this case we have individual blog posts and a blog overview with an optional query parameter. We need to add the Url.Parser.Query module to write our URL parser this time: import Url.Parser exposing (Parser, (), (), int, map, oneOf, s, string) import Url.Parser.Query as Query type Route = BlogPost Int String | BlogQuery (Maybe String TEXT FIELDS · AN INTRODUCTION TO ELM We know we have to keep track of whatever the user has typed into the text field. We need that information to know how to render the reversed text. So we go with this: type alias Model = { content : String } This time I chose to represent the model as a record. The record stores the user input inTRY ELM!
Online Editor. Write and compile code online! Hello World! Buttons. Clock. Cat GIFs. Cards. More! Check out the official guide for atutorial on Elm.
COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies.DOCS/RECORDS
INSTALLATION · AN INTRODUCTION TO ELM Installation. We have come a long way without installing anything! We learned The Elm Architecture. We learned about types. We learned how to interact with the outside world through commands and subscriptions. Things are going well, but we need to get Elm working on your computer for the next couple sections! The next two pages will show how to CODE EDITOR · AN INTRODUCTION TO ELM Step 1: Download Sublime Text from here. Step 2: Install the "Elm Syntax Highlighting" plugin. Mac. Linux. Windows. After going through those steps, it should be possible to open Elm files with syntax highlighting. Keywords like import and type should be colorful so thecode is
JSON · AN INTRODUCTION TO ELM import Browser import Html exposing (..) import Html.Attributes exposing (..) import Html.Events exposing (..) import Http import Json.Decode exposing (Decoder, field MINIFICATION · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG RANDOM · AN INTRODUCTION TO ELM Random. So far we have only seen commands to make HTTP requests, but we can command other things as well, like generating random values! So we are going to make an app that rolls dice, producing a random numberbetween 1 and 6.
HTML.LAZY · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG URL PARSING · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORGTRY ELM!
Online Editor. Write and compile code online! Hello World! Buttons. Clock. Cat GIFs. Cards. More! Check out the official guide for atutorial on Elm.
COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies.DOCS/RECORDS
INSTALLATION · AN INTRODUCTION TO ELM Installation. We have come a long way without installing anything! We learned The Elm Architecture. We learned about types. We learned how to interact with the outside world through commands and subscriptions. Things are going well, but we need to get Elm working on your computer for the next couple sections! The next two pages will show how to CODE EDITOR · AN INTRODUCTION TO ELM Step 1: Download Sublime Text from here. Step 2: Install the "Elm Syntax Highlighting" plugin. Mac. Linux. Windows. After going through those steps, it should be possible to open Elm files with syntax highlighting. Keywords like import and type should be colorful so thecode is
JSON · AN INTRODUCTION TO ELM import Browser import Html exposing (..) import Html.Attributes exposing (..) import Html.Events exposing (..) import Http import Json.Decode exposing (Decoder, field MINIFICATION · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG RANDOM · AN INTRODUCTION TO ELM Random. So far we have only seen commands to make HTTP requests, but we can command other things as well, like generating random values! So we are going to make an app that rolls dice, producing a random numberbetween 1 and 6.
HTML.LAZY · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG URL PARSING · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORGTRY ELM!
Online Editor. Write and compile code online! Hello World! Buttons. Clock. Cat GIFs. Cards. More! Check out the official guide for atutorial on Elm.
NEWS - ELM
News. This page focuses on news about the compiler and core libraries. For more frequent news, check out these retweets and the community forums to hear about packages, tooling, editors, blogs, projects, etc.. Announcements. The Syntax Cliff; Towards a Homegrown ProgrammingLanguage
DOCS/RECORDS
A record is a lightweight labeled data structure. For instance, if we wanted to represent a point we just create a record with an x and y field: { x = 3, y = 4 } Just like tuples, a record can hold values with different types, so we can represent a book like this: { title = "Steppenwolf", author = "Hesse", pages = 237 } COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies. INSTALLATION · AN INTRODUCTION TO ELM Installation. We have come a long way without installing anything! We learned The Elm Architecture. We learned about types. We learned how to interact with the outside world through commands and subscriptions. Things are going well, but we need to get Elm working on your computer for the next couple sections! The next two pages will show how toDOCS/STYLE-GUIDE
Goal: a consistent style that is easy to read and produces clean diffs. This means trading aggressively compact code for regularity and ease of modification. Line Length. Keep it under 80 characters. Going over is not the end of the world, but consider refactoring before you decide a line really must be longer. STRUCTURE · AN INTRODUCTION TO ELM Folks coming from React expect everything to be components. Actively trying to make components is a recipe for disaster in Elm. The root issue is that components are objects: components = local state + methods. local state + methods = objects. URL PARSING · AN INTRODUCTION TO ELM In this case we have individual blog posts and a blog overview with an optional query parameter. We need to add the Url.Parser.Query module to write our URL parser this time: import Url.Parser exposing (Parser, (), (), int, map, oneOf, s, string) import Url.Parser.Query as Query type Route = BlogPost Int String | BlogQuery (Maybe String HTTP · AN INTRODUCTION TO ELM HTTP. It is often helpful to grab information from elsewhere on the internet. For example, say we want to load the full text of Public Opinion by Walter Lippmann. Published in 1922, this book provides a historical perspective on the rise of mass media and its implicationsfor democracy.
TEXT FIELDS · AN INTRODUCTION TO ELM We know we have to keep track of whatever the user has typed into the text field. We need that information to know how to render the reversed text. So we go with this: type alias Model = { content : String } This time I chose to represent the model as a record. The record stores the user input inTRY ELM!
Online Editor. Write and compile code online! Hello World! Buttons. Clock. Cat GIFs. Cards. More! Check out the official guide for atutorial on Elm.
COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies.DOCS/RECORDS
CODE EDITOR · AN INTRODUCTION TO ELM Step 1: Download Sublime Text from here. Step 2: Install the "Elm Syntax Highlighting" plugin. Mac. Linux. Windows. After going through those steps, it should be possible to open Elm files with syntax highlighting. Keywords like import and type should be colorful so thecode is
JSON · AN INTRODUCTION TO ELM import Browser import Html exposing (..) import Html.Attributes exposing (..) import Html.Events exposing (..) import Http import Json.Decode exposing (Decoder, field MINIFICATION · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG RANDOM · AN INTRODUCTION TO ELM Random. So far we have only seen commands to make HTTP requests, but we can command other things as well, like generating random values! So we are going to make an app that rolls dice, producing a random numberbetween 1 and 6.
TYPES AS SETS · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG HTML.LAZY · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG URL PARSING · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORGTRY ELM!
Online Editor. Write and compile code online! Hello World! Buttons. Clock. Cat GIFs. Cards. More! Check out the official guide for atutorial on Elm.
COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies.DOCS/RECORDS
CODE EDITOR · AN INTRODUCTION TO ELM Step 1: Download Sublime Text from here. Step 2: Install the "Elm Syntax Highlighting" plugin. Mac. Linux. Windows. After going through those steps, it should be possible to open Elm files with syntax highlighting. Keywords like import and type should be colorful so thecode is
JSON · AN INTRODUCTION TO ELM import Browser import Html exposing (..) import Html.Attributes exposing (..) import Html.Events exposing (..) import Http import Json.Decode exposing (Decoder, field MINIFICATION · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG RANDOM · AN INTRODUCTION TO ELM Random. So far we have only seen commands to make HTTP requests, but we can command other things as well, like generating random values! So we are going to make an app that rolls dice, producing a random numberbetween 1 and 6.
TYPES AS SETS · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG HTML.LAZY · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG URL PARSING · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORGTRY ELM!
Online Editor. Write and compile code online! Hello World! Buttons. Clock. Cat GIFs. Cards. More! Check out the official guide for atutorial on Elm.
NEWS - ELM
News. This page focuses on news about the compiler and core libraries. For more frequent news, check out these retweets and the community forums to hear about packages, tooling, editors, blogs, projects, etc.. Announcements. The Syntax Cliff; Towards a Homegrown ProgrammingLanguage
DOCS/RECORDS
A record is a lightweight labeled data structure. For instance, if we wanted to represent a point we just create a record with an x and y field: { x = 3, y = 4 } Just like tuples, a record can hold values with different types, so we can represent a book like this: { title = "Steppenwolf", author = "Hesse", pages = 237 } COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies. INSTALLATION · AN INTRODUCTION TO ELM Installation. We have come a long way without installing anything! We learned The Elm Architecture. We learned about types. We learned how to interact with the outside world through commands and subscriptions. Things are going well, but we need to get Elm working on your computer for the next couple sections! The next two pages will show how toDOCS/STYLE-GUIDE
Goal: a consistent style that is easy to read and produces clean diffs. This means trading aggressively compact code for regularity and ease of modification. Line Length. Keep it under 80 characters. Going over is not the end of the world, but consider refactoring before you decide a line really must be longer. STRUCTURE · AN INTRODUCTION TO ELM Folks coming from React expect everything to be components. Actively trying to make components is a recipe for disaster in Elm. The root issue is that components are objects: components = local state + methods. local state + methods = objects. URL PARSING · AN INTRODUCTION TO ELM In this case we have individual blog posts and a blog overview with an optional query parameter. We need to add the Url.Parser.Query module to write our URL parser this time: import Url.Parser exposing (Parser, (), (), int, map, oneOf, s, string) import Url.Parser.Query as Query type Route = BlogPost Int String | BlogQuery (Maybe String HTTP · AN INTRODUCTION TO ELM HTTP. It is often helpful to grab information from elsewhere on the internet. For example, say we want to load the full text of Public Opinion by Walter Lippmann. Published in 1922, this book provides a historical perspective on the rise of mass media and its implicationsfor democracy.
TEXT FIELDS · AN INTRODUCTION TO ELM We know we have to keep track of whatever the user has typed into the text field. We need that information to know how to render the reversed text. So we go with this: type alias Model = { content : String } This time I chose to represent the model as a record. The record stores the user input inTRY ELM!
Online Editor. Write and compile code online! Hello World! Buttons. Clock. Cat GIFs. Cards. More! Check out the official guide for atutorial on Elm.
COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies.DOCS/RECORDS
CODE EDITOR · AN INTRODUCTION TO ELM Step 1: Download Sublime Text from here. Step 2: Install the "Elm Syntax Highlighting" plugin. Mac. Linux. Windows. After going through those steps, it should be possible to open Elm files with syntax highlighting. Keywords like import and type should be colorful so thecode is
JSON · AN INTRODUCTION TO ELM import Browser import Html exposing (..) import Html.Attributes exposing (..) import Html.Events exposing (..) import Http import Json.Decode exposing (Decoder, field MINIFICATION · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG RANDOM · AN INTRODUCTION TO ELM Random. So far we have only seen commands to make HTTP requests, but we can command other things as well, like generating random values! So we are going to make an app that rolls dice, producing a random numberbetween 1 and 6.
TYPES AS SETS · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG HTML.LAZY · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG URL PARSING · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORGTRY ELM!
Online Editor. Write and compile code online! Hello World! Buttons. Clock. Cat GIFs. Cards. More! Check out the official guide for atutorial on Elm.
COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies.DOCS/RECORDS
CODE EDITOR · AN INTRODUCTION TO ELM Step 1: Download Sublime Text from here. Step 2: Install the "Elm Syntax Highlighting" plugin. Mac. Linux. Windows. After going through those steps, it should be possible to open Elm files with syntax highlighting. Keywords like import and type should be colorful so thecode is
JSON · AN INTRODUCTION TO ELM import Browser import Html exposing (..) import Html.Attributes exposing (..) import Html.Events exposing (..) import Http import Json.Decode exposing (Decoder, field MINIFICATION · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG RANDOM · AN INTRODUCTION TO ELM Random. So far we have only seen commands to make HTTP requests, but we can command other things as well, like generating random values! So we are going to make an app that rolls dice, producing a random numberbetween 1 and 6.
TYPES AS SETS · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG HTML.LAZY · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORG URL PARSING · AN INTRODUCTION TO ELMSEE MORE ON GUIDE.ELM-LANG.ORGTRY ELM!
Online Editor. Write and compile code online! Hello World! Buttons. Clock. Cat GIFs. Cards. More! Check out the official guide for atutorial on Elm.
NEWS - ELM
News. This page focuses on news about the compiler and core libraries. For more frequent news, check out these retweets and the community forums to hear about packages, tooling, editors, blogs, projects, etc.. Announcements. The Syntax Cliff; Towards a Homegrown ProgrammingLanguage
DOCS/RECORDS
A record is a lightweight labeled data structure. For instance, if we wanted to represent a point we just create a record with an x and y field: { x = 3, y = 4 } Just like tuples, a record can hold values with different types, so we can represent a book like this: { title = "Steppenwolf", author = "Hesse", pages = 237 } COMMANDS AND SUBSCRIPTIONS · AN INTRODUCTION TO ELM There are tons of other packages on package.elm-lang.org though! So when you are making your own Elm programs locally, it will probably involve running some commands like this in the terminal: elm init elm install elm/http elm install elm/random. That would set up an elm.json file with elm/http and elm/random as dependencies. INSTALLATION · AN INTRODUCTION TO ELM Installation. We have come a long way without installing anything! We learned The Elm Architecture. We learned about types. We learned how to interact with the outside world through commands and subscriptions. Things are going well, but we need to get Elm working on your computer for the next couple sections! The next two pages will show how toDOCS/STYLE-GUIDE
Goal: a consistent style that is easy to read and produces clean diffs. This means trading aggressively compact code for regularity and ease of modification. Line Length. Keep it under 80 characters. Going over is not the end of the world, but consider refactoring before you decide a line really must be longer. STRUCTURE · AN INTRODUCTION TO ELM Folks coming from React expect everything to be components. Actively trying to make components is a recipe for disaster in Elm. The root issue is that components are objects: components = local state + methods. local state + methods = objects. URL PARSING · AN INTRODUCTION TO ELM In this case we have individual blog posts and a blog overview with an optional query parameter. We need to add the Url.Parser.Query module to write our URL parser this time: import Url.Parser exposing (Parser, (), (), int, map, oneOf, s, string) import Url.Parser.Query as Query type Route = BlogPost Int String | BlogQuery (Maybe String HTTP · AN INTRODUCTION TO ELM HTTP. It is often helpful to grab information from elsewhere on the internet. For example, say we want to load the full text of Public Opinion by Walter Lippmann. Published in 1922, this book provides a historical perspective on the rise of mass media and its implicationsfor democracy.
TEXT FIELDS · AN INTRODUCTION TO ELM We know we have to keep track of whatever the user has typed into the text field. We need that information to know how to render the reversed text. So we go with this: type alias Model = { content : String } This time I chose to represent the model as a record. The record stores the user input inelm
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FEATURES
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NO RUNTIME EXCEPTIONS Elm uses type inference to detect corner cases and give friendly hints. NoRedInk switched to Elm about two years ago, and 250k+ lines later, they still have not had to scramble to fix a confusing runtime exception in production. (details ) -- TYPE MISMATCH ---------------------------- Main.elm The 1st argument to `drop` is not what I expect: 8| List.drop (String.toInt userInput) ^^^^^^^^^^^^^^^^^^^^^^ This `toInt` call produces: Maybe Int But `drop` needs the 1st argument to be: Int Hint: Use Maybe.withDefault to handle possible errors.*
GREAT PERFORMANCE
Elm has its own virtual DOM implementation, designed for simplicity and speed. All values are immutable in Elm, and the benchmarks show that this helps us generate particularly fast JavaScript code.(details )
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ENFORCED SEMANTIC VERSIONING Elm can detect all API changes automatically thanks to its type system. We use that information to guarantee that every single Elm package follows semantic versioning precisely. No surprises in PATCH releases. (details ) $ elm diff Microsoft/elm-json-tree-view 1.0.0 2.0.0 This is a MAJOR change. ---- JsonTree - MAJOR ---- Changed: - parseString : String -> Result String Node + parseString : String -> Result Error Node - parseValue : Value -> Result String Node + parseValue : Value ->Result Error Node
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SMALL ASSETS
Smaller assets means faster downloads and faster page loads, so Elm does a bunch of optimizations to make small assets the default. Just compile with the --optimize flag and let the compiler do the rest. No complicated set up. (details)
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JAVASCRIPT INTEROP
Elm can take over a single node, so you can try it out on a small part of an existing project. Try it for something small. See if you likeit. (details )
var Elm = require('./dist/elm/main.js'); var app = Elm.Main.init({ node: document.getElementById('elm-app') }); // set up ports here Install — Compiler Source — Site Source — © 2012-2020 Evan CzaplickiDetails
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