How to get the inner object value dynamically

Question

I have 2 objects like this

var row = {
    destination: {
        id: 1,
        name: 'test'
    },
    name: 'test2',
    source: 'source2'
};
var obj = [{'index': 'name'}, {'index': 'source'}, {'index': 'destination.name'}];

Now looping on obj I can get values of row but not for the destination.name

for(var i=0;i<obj.length;i++){
    console.log(row[obj.index]);
}

Output

test2
source2
undefined

@Praveen: No, it's valid syntax. `obj.index` is evaluated first and then *that* value is used as property name. *edit:* ah yeah, the `i` is missing. But I guess it's just a typo here, otherwise the OP would not get that output. — Felix Kling, Feb 06 '14 at 07:20
@Praveen: Not *syntax*, but definitely an error. Should be `row[obj[i].index]` I believe. — T.J. Crowder, Feb 06 '14 at 07:20
@FelixKling oops. sorry my bad, missing `i` value within that. — Praveen, Feb 06 '14 at 07:20
How to determine at runtime that the object has some inner level object??? — coure2011, Feb 06 '14 at 07:25
Well, if you look at the accepted answer in the linked question, the function returns `undefined` if the property doesn't exist. — Felix Kling, Feb 06 '14 at 07:27
@coure2011 The problem is `'destination.name'` is considering as a whole string. Hence it is not considering it. So you need to again check into it. — Praveen, Feb 06 '14 at 07:37

score 0 · Answer 1 · answered Feb 06 '14 at 07:35

Solution for your question

var row = {
  destination: {
    id: 1,
    name: 'test'
  },
  name: 'test2',
  source: 'source2'
};
var obj = [
 {'index': 'name'}, 
 {'index': 'source'}, 
 {'index': {'destination':'name'}}
];

for(var i=0;i<obj.length;i++){
  if(typeof(obj[i].index) == 'object'){
    var x = obj[i].index;
    var key = Object.keys(x)[0];
    var innerkey = obj[i].index[key];
    console.log(row[key][innerkey]);
  } else {
    console.log(row[obj[i].index]);
  }
}

How to get the inner object value dynamically

1 Answers1