Get total number of items on Json object

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

User · Answer

That s an Object and you want to count the properties of it   Object keys jsonArray  length   References    Object keys  Kangax s compat table

User · Answer

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

User · Answer

Is that your actual code  A javascript object  which is what you ve given us  does not have a length property  so in this case exampleArray length returns undefined rather than 5   This stackoverflow explains the length differences between an object and an array  and this stackoverflow shows how to get the  size  of an object

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

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