如何基于 N 个数组创建嵌套 while 循环？

Question

我正在尝试创建下面给出的数组的所有可能变体的组合，这些变体非常不言自明。

let arr1 = ['Small', 'Medium', 'Large', 'Extra-Large']
let arr2 = ['Black','Red','White']
let arr3 = ['Normal','Limited-Edition']

let combos = []

arr1.forEach((i) => {
  arr2.forEach((j) => {
    arr3.forEach((k) => {
      combos.push(i + '-' + j + '-' + k)
    })
  }) 
})

console.log(combos)

这给出了我想要的输出，但是我想创建一个函数，该函数接受任意数组 [arr1, arr2, arr3.....arrN] 并为每个数组创建一个嵌套循环，和 returns 字符串的组合值。

如何创建这样的函数？

Answer 1

您可以通过 reduce 使用类似的东西。我引用了 this post

let arr1 = ['Small', 'Medium', 'Large', 'Extra-Large'] 
let arr2 = ['Black','Red','White']
let arr3 = ['Normal','Limited-Edition']
let arr4 = ['x','y','z']

let arr = [arr1,arr2,arr3,arr4]

 let combined = arr.reduce((a,c)=>{
    return a.flatMap(x=>c.map(y=>x.concat(y)))
},[[]]).map((z) => z.join("-"))
 
 console.log(combined)
  console.log(combined.length) //4*3*2*3 = 72

UPDATE - 这个直接取自最上面的答案，做了非常小的修改

let arr1 = ['Small', 'Medium', 'Large', 'Extra-Large'] 
let arr2 = ['Black','Red','White']
let arr3 = ['Normal','Limited-Edition']
let arr4 = ['x','y','z']

let arr = [arr1,arr2,arr3,arr4]

const cartesian =
  (a) => a.reduce((a, b) => a.flatMap(d => b.map(e => [d, e].flat()))).map(x=>x.join("-"));

console.log(cartesian(arr))

Answer 2

    const arr1 = ['Small', 'Medium', 'Large', 'Extra-Large'] 
    const arr2 = ['Black','Red','White']
    const arr3 = ['Normal','Limited-Edition']
    const arr4 = ['x','y','z']
  
    const arr = [arr1,arr2,arr3,arr4]
    const merged = [].concat.apply([], arr);

    console.log(merged);

如何基于 N 个数组创建嵌套 while 循环？

How to create a nested while loop based on N number of arrays?

javascript

arrays

loops

nested