Useful One-Liners (JavaScript)

oneliners.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.
debugger;

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

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

// 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 without adding curly braces
const addFortyTwo = number => console.log(number) || number + 42;
// or
const add42 = n => (console.log(n), n + 42);

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

// Random hex color
'#' + Math.floor(Math.random() * 0xFFFFFF).toString(16)

// Easy Toggle
let flag; const toggleFlag = () => ( flag = !flag );