Get the value of an object property dynamically

Question

I want to get the value of an object property. For reasons I wont go in to, I need the function to be abstract so i can use it in different scenarios. Here's what I have:

function getPropertyValue(obj, prop){
    return obj.prop;
}

var obj = {
    name: "tom",
    age: 23
}

console.log('age is ');
console.log(getPropertyValue(obj, "age"));

This returns underfined because it's looking for the property "prop" on the object, which doesn't exist. How do I get it to look for the property passed as prop, e.g. if "name" is passed as prop it would look for obj.name?

The jsfiddle is here

its not `obj.prop` , refer properties using [square] brackets, like `obj[prop]` — Murtaza Zaidi, Oct 08 '14 at 14:39

score 3 · Answer 1 · answered Oct 08 '14 at 14:36

3

Simply use bracket notation:

function getPropertyValue(obj, prop){
    return obj[prop];
}

answered Oct 08 '14 at 14:36

David Thomas

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377
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score 2 · Accepted Answer · answered Oct 08 '14 at 14:37

2

function getPropertyValue(obj, prop){
    return obj[prop];
}

var obj = {
    name: "tom",
    age: 23
}

var name = getPropertyValue(obj,"name");
var age = getPropertyValue(obj,"age");

answered Oct 08 '14 at 14:37

WhiteLine

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Get the value of an object property dynamically

2 Answers2