JavaScript one-liners

one-liners.js

// Remove any duplicates from an array of primitives.
const unique = [...new Set(arr)]

// Sleep in async functions. Use: await sleep(2000).
const sleep = ms => (new Promise(resolve => setTimeout(resolve, ms))

// Type this in your code to break chrome debugger in that line (breakpoint).
debugger

// Just plain english.
[...].every(Number.isFinite)

// Returns all non-falsy values from an array.
[...].filter(Boolean)

// Array destructuring to see matching elements.
let [r, g, b, a] = [255, 0, 0, 255]

// Object destructuring to reduce multiple lines of code to a single line.
let { width, height } = resolution

// Gets an item from the list and wraps around to the start if n is larger than the list.
items[n % items.length]

// console.log in array function withour adding curly braces.
const addFortyTwo = number => console.log(number) || number + 42

// Same as above
const add42 = n => (console.log(n), number + 42)

// Log variables with names.
console.log({ a, b, c, d, e })

// Random hex color
'#' + Math.floor(Math.random() * 16777215).toString(16)

// Same as above
'#' + (Math.random() * 0xFFFFFF << 0).toString(16)

// Alternative to Math.floor
~~anyNumber