Javascript counting number of objects in object

Question

I have an object something like   Object  0 Object  1 Object  2 Object     Output from console log obj Data     But there is no way that I can count the number of objects in object  then finally get the attribute value from the sub objects   I have tried  console log obj Data 0  length      It does not work  console log obj Data length      It does not work   This is a bit tricky for me  Hope you guys can help

User · Answer

Try Demo Here   var list      var count  Object keys list  length

User · Answer

The easiest way to do this  with excellent performance and compatibility with both old and new browsers  is to include either Lo-Dash or Underscore in your page   Then you can use either   size object  or   keys object  length  For your obj Data  you could test this with   console log    size obj Data       or   console log    keys obj Data  length      Lo-Dash and Underscore are both excellent libraries  you would find either one very useful in your code   They are rather similar to each other  Lo-Dash is a newer version with some advantanges    Alternatively  you could include this function in your code  which simply loops through the object s properties and counts them   function ObjectLength  object         var length   0      for  var key in object             if  object hasOwnProperty key                    length                      return length       You can test this with   console log  ObjectLength obj Data       That code is not as fast as it could be in modern browsers  though  For a version that s much faster in modern browsers and still works in old ones  you can use   function ObjectLength Modern  object         return Object keys object  length     function ObjectLength Legacy  object         var length   0      for  var key in object             if  object hasOwnProperty key                    length                      return length     var ObjectLength       Object keys   ObjectLength Modern   ObjectLength Legacy    and as before  test it with   console log  ObjectLength obj Data       This code uses Object keys object  length in modern browsers and falls back to counting in a loop for old browsers   But if you re going to all this work  I would recommend using Lo-Dash or Underscore instead and get all the benefits those libraries offer   I set up a jsPerf that compares the speed of these various approaches  Please run it in any browsers you have handy to add to the tests   Thanks to Barmar for suggesting Object keys for newer browsers in his answer

User · Answer

In recent browsers you can use   Object keys obj Data  length   See MDN  For older browsers  use the for-in loop in Michael Geary s answer

[javascript] Javascript counting number of objects in object

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