JavaScript如何改组数组?
我想改写JavaScript中的元素数组,如下所示:
[0, 3, 3] -> [3, 0, 3][9, 3, 6, 0, 6] -> [0, 3, 6, 9, 6]
[3, 3, 6, 0, 6] -> [0, 3, 6, 3, 6]
回答:
使用现代版本的Fisher-Yates随机播放算法:
/** * Shuffles array in place.
* @param {Array} a items An array containing the items.
*/
function shuffle(a) {
var j, x, i;
for (i = a.length - 1; i > 0; i--) {
j = Math.floor(Math.random() * (i + 1));
x = a[i];
a[i] = a[j];
a[j] = x;
}
return a;
}
回答:
/** * Shuffles array in place. ES6 version
* @param {Array} a items An array containing the items.
*/
function shuffle(a) {
for (let i = a.length - 1; i > 0; i--) {
const j = Math.floor(Math.random() * (i + 1));
[a[i], a[j]] = [a[j], a[i]];
}
return a;
}
但是请注意,,将变量与解构分配交换会导致严重的性能损失。
回答:
var myArray = ['1','2','3','4','5','6','7','8','9'];shuffle(myArray);
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