一尘不染

JavaScript如何改组数组?

javascript

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]

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2020-04-22

共1个答案

一尘不染

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;
}

ES2015(ES6)版本

/**
 * 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。

使用

var myArray = ['1','2','3','4','5','6','7','8','9'];
shuffle(myArray);
2020-04-22