34

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)?

Felix Kling
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Prashant
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    By the way, that isn't a JSON object—it's a *JavaScript* object. JSON is simply a data storage format that's based on JavaScript syntax. – Steve Harrison Jan 08 '10 at 10:27

3 Answers3

73

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).

Steve Harrison
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8

myObject["0"]

Amarghosh
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1

if you have data like 

  `"rain": {
           "3h": 0
         },`

then you can simply access it rain['3h']

paicubes
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