Tutorial JavaScript: Cara membuat senarai menggunakan matriks

Question

我有一个像这样的数组

const input_array= [
    ["hitam", "biru"],
    ["besar", "sederhana"],
    ["a", "b", "c"]
    //... adakah ia dinamik boleh ditambah banyak baris
  ];

我该如何得到一个像这样的数组：

const finallist = [
    ["hitam", "besar", "a"],
    ["hitam", "besar", "b"],
    ["hitam", "besar", "c"],
      
    ["hitam", "sederhana", "a"],
    ["hitam", "sederhana", "b"],
    ["hitam", "sederhana", "c"],

    ["biru", "besar", "a"],
    ["biru", "besar", "b"],
    ["biru", "besar", "c"],
      
    ["biru", "sederhana", "a"],
    ["biru", "sederhana", "b"],
    ["biru", "sederhana", "c"],
  ]

请记住input_array是动态的

请告诉我如何做到这一点

Answer 1

Anda boleh melakukan sesuatu seperti ini:

const input_array = [
    ["black", "blue"],
    ["large", "medium"],
    ["a", "b", "c"]
]
const getCompinations = array =>
  array.reduce((v, b) =>
    v.reduce((r, g) => [...r, ...b.map(w => [].concat(g, w))], [])
  )
console.log(getCompinations(input_array))

Answer 2

Sila lihat ini, ia mungkin membantu:

const input_array = [
    ["black", "blue"],
    ["large", "medium"],
    ["a", "b", "c"]
    //... 是否可以动态添加多行
];
const mmc = input_array.reduce((e, r) => e * r.length, 1);
const finallist = input_array.map((x,i)=>({index:i,arr:x})).reduce((e, r) => {
    for (var u = 0; u < mmc; u++) e[u] && (!r.arr.some(r => e[u].includes(r)) || e[u].length <= r.index) ? e[u].push(r.arr[u % r.arr.length]) : e.push([r.arr[u % r.arr.length]]);
    return e.sort(), e
}, []);

Berhati-hati! Boleh menyebabkan ranap penyemak imbas dalam matriks besar.