Access to object keys in javascript [duplicate]

Question

I have a json that is something like this:

user = 
    {
       "info": {
                 "id": "....",
                  ......
       },
       ......
     }

So.. i can get the id using user.info.id but i need a function that can give me a property of an object using something like getInfo(user, "info.id") i already tried my luck with user["info.id"]. Has JavaScript already got something like this? Or, how can i implement this?

BTW, I'm using node.js :)

You can access properties using [] syntax: user["info"]["id"]. So just implement a function that will transform your input into valid JS — Vsevolod Goloviznin
– Vsevolod Goloviznin, Commented Jan 12, 2017 at 12:37
Well.. how can i go about it? I can have more then only one "." or .. even none — user5622060
– user5622060, Commented Jan 12, 2017 at 12:40

Nenad Vracar · Accepted Answer · 2017-01-12 12:41:52Z

0

You can use reduce() to create such function.

var user = {
  "info": {
    "id": 3,
  },
}

function getInfo(data, key) {
  return key.split('.').reduce(function(r, e) {
    return r[e]
  }, data)
}

console.log(getInfo(user, "info.id"))

With ES6 arrow function

function getInfo(data, key) {
  return key.split('.').reduce((r, e) => r[e] , data)
}

answered Jan 12, 2017 at 12:41

Nenad Vracar

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