Access to object keys in javascript

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, Jan 12 '17 at 12:37
Well.. how can i go about it? I can have more then only one "." or .. even none — user5622060, Jan 12 '17 at 12:40

score 0 · Accepted Answer · answered Jan 12 '17 at 12:41

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)
}

Access to object keys in javascript

1 Answers1