how to randomize an array

Solutions on MaxInterview for how to randomize an array by the best coders in the world

showing results for - "how to randomize an array"
Emil
15 Aug 2017
1function randomArrayShuffle(array) {
2  var currentIndex = array.length, temporaryValue, randomIndex;
3  while (0 !== currentIndex) {
4    randomIndex = Math.floor(Math.random() * currentIndex);
5    currentIndex -= 1;
6    temporaryValue = array[currentIndex];
7    array[currentIndex] = array[randomIndex];
8    array[randomIndex] = temporaryValue;
9  }
10  return array;
11}
12var alphabet=["a","b","c","d","e"];
13randomArrayShuffle(alphabet); 
14//alphabet is now shuffled randomly = ["d", "c", "b", "e", "a"]
15
16
17
Pietro
14 Apr 2017
1const getShuffledArr = arr => {
2    const newArr = arr.slice()
3    for (let i = newArr.length - 1; i > 0; i--) {
4        const rand = Math.floor(Math.random() * (i + 1));
5        [newArr[i], newArr[rand]] = [newArr[rand], newArr[i]];
6    }
7    return newArr
8};
Nicolò
22 Jun 2017
1let unshuffled = ['hello', 'a', 't', 'q', 1, 2, 3, {cats: true}]
2
3let shuffled = unshuffled
4  .map((a) => ({sort: Math.random(), value: a}))
5  .sort((a, b) => a.sort - b.sort)
6  .map((a) => a.value)
7
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