javascript中的数组组合,错了吗?

Array combinatorics in javascript, It's wrong?

我创建了这个脚本,因为当我收到 n 个数组时需要执行独特的组合。它可以工作,但是当我想存储在最终数组中时,它会写一些不同的东西。

let options = {
    "A": ["A1", "A2", "A3", "A4"],
    "B": ["B1", "B2"],
    "C": ["C1", "C2", "C3", "C4", "C5"],
};

let keys = Object.getOwnPropertyNames(options);
let size = keys.length;

let final = [];

function combinate(n, o) {

    for (let i = 0; i < options[keys[n]].length; i++) {

        if (n === (size - 1)) {
            o = {};
        }

        o[keys[n]] = options[keys[n]][i];

        if ((n - 1) >= 0) {
            combinate(n - 1, o);
        }

        if (n === 0) {
            console.log(o);
            final.push(o);
        }

    }

}

if (size > 0) combinate(size - 1, {});

console.log("-----------------------------------")
console.log(final);

您在数组中多次保存对同一对象的引用,并对该对象进行了更改。您需要将对象的新副本放入数组中。

更改:final.push(o);final.push(Object.assign({}, o));

或者,更直接地说:final.push({A:o.A, B:o.B, C:o.C});

需要将对象的引用传入函数,然后将修改后的对象复制到final数组

let options = {
    "A": ["A1", "A2", "A3", "A4"],
    "B": ["B1", "B2"],
    "C": ["C1", "C2", "C3", "C4", "C5"], };

let keys = Object.getOwnPropertyNames(options); 
let size = keys.length;

let final = [];

function combinate(n, o, fooFinal) {

    for (let i = 0; i < options[keys[n]].length; i++) {

        if (n === (size - 1)) {
            o = {};
        }

        o[keys[n]] = options[keys[n]][i];

        if ((n - 1) >= 0) {
            combinate(n - 1, o, fooFinal);
        }

        if (n === 0) {
            console.log(o);
            fooFinal.push(o);
        }

    }
    if(n===size-1){
      return fooFinal;
    }

}

if (size > 0){
  final = combinate(size - 1, {},[]);
}

console.log("-----------------------------------") 
console.log(final);