我有一个这样的数组:

var arr1 = ["a", "b", "c", "d"];

我如何随机化/打乱它?


当前回答

使用递归JS。

这不是最好的实现,但它是递归的,并且尊重不变性。

const randomizer = (array, output = []) => {
    const arrayCopy = [...array];
    if (arrayCopy.length > 0) {    
        const idx = Math.floor(Math.random() * arrayCopy.length);
        const select = arrayCopy.splice(idx, 1);
        output.push(select[0]);
        randomizer(arrayCopy, output);
    }
    return output;
};

其他回答

// Create a places array which holds the index for each item in the
// passed in array.
// 
// Then return a new array by randomly selecting items from the
// passed in array by referencing the places array item. Removing that
// places item each time though.
function shuffle(array) {
    let places = array.map((item, index) => index);
    return array.map((item, index, array) => {
      const random_index = Math.floor(Math.random() * places.length);
      const places_value = places[random_index];
      places.splice(random_index, 1);
      return array[places_value];
    })
}

有趣的是,没有非变异递归答案:

var shuffle=arr=>{常量重复=(arr,currentIndex)=>{console.log(“什么?”,JSON.stringify(arr))如果(当前索引==0){返回arr;}const randomIndex=数学地板(Math.random()*当前索引);常量swap=arr[currentIndex];arr[currentIndex]=arr[randomIndex];arr[randomIndex]=掉期;返回重复(arr,当前索引-1);}返回递归(arr.map(x=>x),arr.length-1);};var arr=[1,2,3,4,5,[6];console.log(shuffle(arr));控制台日志(arr);

随机推送或取消推送(在开头添加)。

['a', 'b', 'c', 'd'].reduce((acc, el) => {
  Math.random() > 0.5 ? acc.push(el) : acc.unshift(el);
  return acc;
}, []);

我想分享解决这个问题的百万种方法之一=)

function shuffleArray(array = ["banana", "ovo", "salsicha", "goiaba", "chocolate"]) {
const newArray = [];
let number = Math.floor(Math.random() * array.length);
let count = 1;
newArray.push(array[number]);

while (count < array.length) {
    const newNumber = Math.floor(Math.random() * array.length);
    if (!newArray.includes(array[newNumber])) {
        count++;
        number = newNumber;
        newArray.push(array[number]);
    }
}

return newArray;

}

//doesn change array
Array.prototype.shuffle = function () {
    let res = [];
    let copy = [...this];

    while (copy.length > 0) {
        let index = Math.floor(Math.random() * copy.length);
        res.push(copy[index]);
        copy.splice(index, 1);
    }

    return res;
};

let a=[1, 2, 3, 4, 5, 6, 7, 8, 9];
console.log(a.shuffle());