Get total number of items on Json object? [duplicate]

Question

Possible Duplicate:
Length of Javascript Object (ie. Associative Array)

I have an object similar to this one:

var jsonArray = {   '-1': {     '-1': 'b',     '2': 'a',     '10': 'c'   },   '2': {     '-1': 'a',     '2': 'b',     '10': 'a'   },   '5': {     '-1': 'a',     '2': 'a',     '10': 'b'   } }; 

I'm trying to get it's length, the problem is that jsonArray.length returns 5 instead of 3 (which is the total items it has). The array is relatively long (has 1000x2000 items) and this must be done a lot of times every second. How can I get the number of items more efficiently?

Answer 1

In addition to kieran's answer, apparently, modern browsers have an Object.keys function. In this case, you could do this:

Object.keys(jsonArray).length; 

More details in this answer on How to list the properties of a javascript object

Answer 2

That's an Object and you want to count the properties of it.

Object.keys(jsonArray).length 

References:

• Object.keys.
• Kangax's compat table.