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Elm Types Glossary

There's a lot of type terminology and jargon going around when discussing types in Elm. This glossary attempts to list some of the most common type terms along with synonyms, terms from other language communities, examples, and links to more detailed articles on each topic.

• Custom Type
• Constructor
• Unit Type

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const first = new Promise(resolve => {
  console.log("First finished."); 
  resolve();
});

const secondWithError = new Promise((resolve, reject) => reject("Second failed"));

const third = new Promise(resolve => {
  setTimeout((() => {
    console.log("Third finished");

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brew update
brew cask install java
brew cask install jce-unlimited-strength-policy
export JAVA_HOME=`/usr/libexec/java_home -v 1.8`

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/* VT100 terminal reset (<ESC>c) */

console.log('\033c');

/* numbers comparations */

> '2' == 2
true

> '2' === 2

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module Main exposing (..)

import Html exposing (Html, div, text)
import Html.App as App
import Keyboard exposing (KeyCode, presses)


type Msg
    = KeyPressed KeyCode

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Destructuring(or pattern matching) is a way used to extract data from a data structure(tuple, list, record) that mirros the construction. Compare to other languages, Elm support much less destructuring but let's see what it got !

Tuple

myTuple = ("A", "B", "C")
myNestedTuple = ("A", "B", "C", ("X", "Y", "Z"))

let
  (a,b,c) = myTuple