Push an object with a variable as a property name onto an array [duplicate]

Question

I have a javascript array and a variable. I want to push onto the array an object with the variable as the property name, but it must hold the value of the variable, not the variable as a string. If I have this code:

array = [];
var x = 10;
array.push({x: y});

The x is stored as a string "x", not a variable that contains the value of var x. Any help is appreciated.

Barmar · Accepted Answer · 2014-06-13 04:11:42Z

16

The property name in an object literal is not evaluated as a variable. You have to assign the property using bracket notation.

var obj = {};
obj[x] = y;
array.push(obj);

answered Jun 13, 2014 at 4:11

Barmar

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1 Comment

Ben Over a year ago

With ES6, this can be done more succinctly {[x]: y}

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