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add ES6 implementation of a shuffle function

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Shahid 2017-11-02 17:00:24 +05:00 committed by pratu16x7
parent bb2aeaa777
commit 15072aaa22
1 changed files with 9 additions and 18 deletions
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27
src/scripts/helpers/utils.js
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@ -30,24 +30,15 @@ export function lightenDarkenColor(col,amt) {
return (usePound?"#":"") + (g | (b << 8) | (r << 16)).toString(16);
}
/**
* Shuffles array in place. ES6 version
* @param {Array} a items An array containing the items.
*/
export function shuffle(array) {
// https://stackoverflow.com/a/2450976/6495043
// Awesomeness: https://bost.ocks.org/mike/shuffle/
//https://stackoverflow.com/questions/6274339/how-can-i-shuffle-an-array?noredirect=1&lq=1
var currentIndex = array.length, temporaryValue, randomIndex;
// While there remain elements to shuffle...
while (0 !== currentIndex) {
// Pick a remaining element...
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex -= 1;
// And swap it with the current element.
temporaryValue = array[currentIndex];
array[currentIndex] = array[randomIndex];
array[randomIndex] = temporaryValue;
for (let i = array.length - 1; i > 0; i--) {
let j = Math.floor(Math.random() * (i + 1));
[array[i], array[j]] = [array[j], array[i]];
}
return array;
}
}