我正在嘗試創建下面給出的陣列的所有可能變體的組合，這些變體非常不言自明。
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)
這給出了我想要的輸出，但是我想創建一個函式，該函式采用任意陣列陣列 [arr1, arr2, arr3.....arrN] 并為每個陣列創建一個嵌套回圈，并回傳一個組合值的字串。
我該如何創建這樣的功能？
uj5u.com熱心網友回復：
你可以使用類似這樣的東西reduce。我參考了這篇文章
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更新- 這個直接取自頂級答案，做了很小的修改
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))uj5u.com熱心網友回復：
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);轉載請註明出處，本文鏈接：https://www.uj5u.com/houduan/442911.html
標籤：javascript 数组 循环 嵌套的
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