JavaScript

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JavaScript
Type
MDN
Array
​MDN​
Date
​MDN​
Object
​MDN​
String
​MDN​
JSON
​MDN​
Set
​MDN​
RegExp
​MDN​
Destructuring Assignment
​MDN​
const
​MDN​
let
​MDN​
export
​MDN​
Variable declarations
var
function scoped
can be redeclared and updated
hoisted and initialized with undefined as a value
let
block scoped
declaring in a for loop, inside an if or in a plain block is not going to let the variable "escape" the block
only use let to reassign the variable
while let and const are hoisted but not initialized
const
immutable
block-scoped
default to const
Array
​https://sdras.github.io/array-explorer/​
​https://flaviocopes.com/javascript-array/​
Object
​https://sdras.github.io/object-explorer/​
​https://codepen.io/thonly/pen/JOdwKM​
Promises
When you go to a restaurant, the hostess gives you a buzzer for your table. When the table is ready, the buzzer buzzes. You respond by sitting at the table.
The buzzer is a promise. It buzzes when the promise resolves, or is ready. The buzz is your handler.
var buzzer = new Promise();
​
fetchTableAsync(hostess => {
    var table = hostess.prepareTable();
    hostess.informServer();
    buzzer.resolve(table);
});
​
buzzer.then(table => me.sitAtTable(table));
​https://github.com/wbinnssmith/awesome-promises​
Currying
Currying is a process to reduce functions of more than one argument to functions of one argument with the help of lambda calculus.
multiply = (n, m) => (n * m)
multiply(3, 4) === 12 // true
​
curryedMultiply = (n) => ( (m) => multiply(n, m) )
triple = curryedMultiply(3)
triple(4) === 12 // true
​https://blog.benestudio.co/currying-in-javascript-es6-540d2ad09400​
Neuroeconomics
Date
Last modified 3yr ago
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Variable declarations