Shuffle Array - JavaScript ES2015, ES6

shuffle.js

// original gist
const shuffleArray = arr => arr.sort(() => Math.random() - 0.5);

// fully random by @BetonMAN
const shuffleArray = arr => arr
  .map(a => [Math.random(), a])
  .sort((a, b) => a[0] - b[0])
  .map(a => a[1]);

shuffleArray([1, 2, 3]) //[3, 1, 2]

@BetonMAN, neat implementation! It seems that the only downside, comparing to the implementation from Wikipedia, is that "the time and space complexity of the sort cannot be guaranteed as it is implementation dependent." MDN Array.sort . It is O(n) in the implementation of Fisher–Yates shuffle on Wikipedia .

Remember that the time complexity of sorting an array with length n is theta(n*log(n)), but the common shuffle algorithm takes theta(n). If the array is long, try to avoid sorting.