来自字符串的Javascript嵌套对象 [英] Javascript nested objects from string

问题描述

我有一个空对象和一个字符串：

I've got an empty object and a string:

var obj = {};
var str = "a.b.c";

有没有办法把它变成

obj = { a: { b: { c: { } } } }

我无法完全理解这一点，我甚至不确定它是否可行。

I can't quite wrap my head around this one and I'm not even sure if it would be possible.

推荐答案

var obj = {};
var str = "a.b.c";
var arr = str.split('.');
var tmp = obj;

for (var i=0,n=arr.length; i<n; i++){
   tmp[arr[i]]={};
   tmp = tmp[arr[i]];
}

ES6：

ES6:

let str = "a.b.c",
    arr = str.split('.'),
    obj, o = obj = {};

arr.forEach(key=>{o=o[key]={}});

console.log(obj);

ES6 /减少（不需要数组存储）：

ES6/Reduced (array storage unnecessary):

let str = "a.b.c", obj, o = obj = {};

str.split('.').forEach(key=>o=o[key]={});

console.log(obj);

ES6 / Array.prototype.reduce：

ES6/Array.prototype.reduce:

let str = "a.b.c", last;

let obj = str.split('.').reduce((o, val) => {
  if (typeof last == 'object')
    last = last[val] = {};
  else
    last = o[val] = {};

  return o;
}, {});

console.log(obj);

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