javascript - 使用键划分数组数组中的对象

Question

考虑以下对象:

{ a1: "Foo", b1: "Boo" , c1: "Coo", a2: "Doo" , b2: "Goo", c2: "Soo", ....... c50: "Zoo" }

我想把它分成一个数组，看起来像这样:

[["Foo","Boo","Coo"], ["Doo","Goo","Soo"]......[ .., ..,"Zoo"]]

这样做的最佳做法是什么？

Answer 1

您可以先在 Object.keys() 上使用 reduce() 返回一个对象，然后使用 map() 对象的键返回值，这将是值的数组。

var obj = { a1: "Foo", b1: "Boo" , c1: "Coo", a2: "Doo" , b2:"Goo", c2:"Soo", c50:"Zoo"}

var o = Object.keys(obj).reduce(function(r, e) {
 var newKey = e.match(/\d+/)[0]
 r[newKey] = (r[newKey] || []).concat(obj[e])
 return r
}, {})

var result = Object.keys(o).map(e => o[e])

console.log(result)

对于 ES-7，您可以使用 Object.values()，但浏览器支持仍然很差，但解决方案如下所示。

var obj = { a1: "Foo", b1: "Boo" , c1: "Coo", a2: "Doo" , b2:"Goo", c2:"Soo", c50:"Zoo"}

var result = Object.values(Object.keys(obj).reduce(function(r, e) {
 var newKey = e.match(/\d+/)[0]
 return r[newKey] = (r[newKey] || []).concat(obj[e]), r
}, {}))


console.log(result)