Arrow Functions in JavaScript / ES6

What are Arrow Functions in JavaScript / ECMAScript 6?

Arrow functions are a simplified short hand method for creating anonymous functions.

Older ES5 JavaScript example:

function setup() {
    createCanvas(600, 400);
    background(0);
    let button = createButton('press')
    button.mousePressed(changeBackground);

    function changeBackground() {
        background(random(255));
    }
}

New ES6 JavaScript Example

function setup() {
    createCanvas(600, 400);
    background(0);
    let button = createButton('press')
    button.mousePressed(() => background(255)));
}

Anonymous Function written as Arrow Function:

() => background(255))

Video: ES6 Arrow Function