JavaScript Array Push key value

javascript arrays push

daryl · Oct 18, 2011 · Viewed 146.3k times · Source

Ok, I'm going a little wrong here and I've already wasted an hour with this so hopefully one of you guys can help me.

var a = ['left','top'],
    x = [];

for(i=0;i<a.length;i++) {
    x.push({
        a[i] : 0
    });
}

How do I go about pushing a value to each of the keys inside the var a array?

You can see my failed attempted but hopefully that will give you an insight into what I'm trying to achieve.

Answer

You have to use bracket notation:

var obj = {};
obj[a[i]] = 0;
x.push(obj);

The result will be:

x = [{left: 0}, {top: 0}];

Maybe instead of an array of objects, you just want one object with two properties:

var x = {};

and

x[a[i]] = 0;

This will result in x = {left: 0, top: 0}.