How to create object property from variable value in javascript?

Question

Hi, I want to add new property to 'myObj', name it 'string1' and give it a value of 'string2', but when I do it it returns 'undefined:

var myObj = new Object;
var a = 'string1';
var b = 'string2';
myObj.a = b;

alert(myObj.string1); //returns 'undefined'
alert(myObj.a); //returns 'string2'

In other words: How to create an object property and give it the name stored in the variable but not the name of the variable itself? Thanks.

Answer 1

There's the dot notation and the array notation, which are equivalent.

myObj[a] = b;

Answer 2

Dot notation and the properties are equivalent. So you would accomplish like so:

var myObj = new Object;
var a = 'string1';
myObj[a] = 'whatever';
alert(myObj.string1)

(alerts "whatever")