js extract property values by name

Question

I have an object:

{
name: "user",
facebook: {
    followers: 2341
},
instagram: {
    followers: 5345
}
}

How can I get an array of all followers values without explicitely specifying the path (e.g. It could also be twitter instead of facebook)

[2341, 5345]

Is their a possibilty of any nesting, or is the structure you show limited to that depth? — JAAulde, May 24 '17 at 13:03
Your answer is [here](https://stackoverflow.com/questions/684672/how-do-i-loop-through-or-enumerate-a-javascript-object) — Abk, May 24 '17 at 13:11

James Kraus · Answer 1 · 2017-05-24T13:03:51.233

1

You're probably going to want to use a for .. in loop to loop over all the properties of the object, then check if they have a followers property, and finally add that property to a list. E.g.:

let myObj = {
  name: "user",
  facebook: {
      followers: 2341
  },
  instagram: {
      followers: 5345
  }
}

let followers = [];

for (var prop in myObj) {
  if (myObj[prop].hasOwnProperty('followers') && typeof myObj[prop].followers === 'number'){
    followers.push(myObj[prop].followers);
  }
}
  
console.log(followers)

edited May 24 '17 at 13:03

answered May 24 '17 at 13:00

James Kraus

3,349
20
27

sry, I forgot to mention that the properties may also be nested deeper in the object – Chris May 24 '17 at 13:01
@Chris, how deep? Can you give a sample object? – Abk May 24 '17 at 13:13
If you need deeply nested 'followers', you need an entirely different approach. Check out @robert's answer – James Kraus May 24 '17 at 13:18

score 1 · Answer 2 · answered May 24 '17 at 13:07

This script searches for all occurrences of the keyword "followers" and adds it value to the array...

var followers = {
  name: "user",
  facebook: {
    followers: 2341,
    test: {
      followers: 1,
    },
  },
  instagram: {
    followers: 5345
  }
};

var followerArray = [];

var getFollowers = function(obj) {
  for (var node in obj) {
    if (typeof obj[node] === 'object') {
      getFollowers(obj[node]);
    }
    
    if (node === 'followers') {
      followerArray.push(obj[node]);
    }
  }
}

getFollowers(followers);

console.log(followerArray);

js extract property values by name

2 Answers2