如何生成笛卡尔积？-灵析社区
我只爱钱现在有这几个数据 let names = ["iPhone X", "iPhone XS"] let colors = ["黑色", "白色"] let storages = ["64g", "256g"] 要转换成 [ { "spec": [ { "name": "iPhone X" }, { "name": "黑色" }, { "name": "64g" } ] }, { "spec": [ { "name": "iPhone X" }, { "name": "黑色" }, { "name": "256g" } ] }, { "spec": [ { "name": "iPhone X" }, { "name": "白色" }, { "name": "64g" } ] }, { "spec": [ { "name": "iPhone X" }, { "name": "白色" }, { "name": "256g" } ] }, { "spec": [ { "name": "iPhone XS" }, { "name": "黑色" }, { "name": "64g" } ] }, { "spec": [ { "name": "iPhone XS" }, { "name": "黑色" }, { "name": "256g" } ] }, { "spec": [ { "name": "iPhone XS" }, { "name": "白色" }, { "name": "64g" } ] }, { "spec": [ { "name": "iPhone XS" }, { "name": "白色" }, { "name": "256g" } ] } ]
三千米的偷感let names = ["iPhone X", "iPhone XS"]
let colors = ["黑色", "白色"]
let storages = ["64g", "256g"]
let combine = function (...chunks) {
let res = []
let helper = function (chunkIndex, prev) {
let chunk = chunks[chunkIndex]
let isLast = chunkIndex === chunks.length - 1
for (let val of chunk) {
let cur = prev.concat({name: val})
if (isLast) {
// 如果已经处理到数组的最后一项了 则把拼接的结果放入返回值中
res.push({spec: cur})
} else {
helper(chunkIndex + 1, cur)
}
}
}
// 从属性数组下标为 0 开始处理
// 并且此时的 prev 是个空数组
helper(0, [])
return res
}
console.log(combine(names, colors, storages))