Question

I have an object like:

var myObject = { '0' : 'blue' };

Now, when I try to access the value of the key ‘0’ like:

myObject.0 

…I am getting an error. (Maybe this is not the proper way?)

How can I access the value of a key that is a number (like the above)?

Answer 1

This should work:

myObject["0"]

(myObject["propertyName"] is an alternative syntax for myObject.propertyName.)

You’re getting the error because, in JavaScript, identifiers can’t begin with a numeral. From the Variables page at the Mozilla Developer Centre:

A JavaScript identifier must start
with a letter, underscore (_), or
dollar sign ($); subsequent characters
can also be digits (0-9). Because
JavaScript is case sensitive, letters
include the characters “A” through “Z”
(uppercase) and the characters “a”
through “z” (lowercase).