Array of Array(containing object) in Javascript

Question

I am trying to create a Array of Array containing objects,

Here is my code,

var objA = new Array();

function myFunction(){
     objA ['1'] = new Array();
     objA ['1'].push({'bird':'parrot','animal':'rabbit'});
     var item = objA ['1'];
     alert(item['bird']);
}

Now ideally above code should alert 'parrot', but instead I get 'undefined'.
What am I doing wrong?

objA is an array but you're passing a string "index", which will work but unexpectedly. Use an object instead, {}. Btw, you can declare an array simply as []. — elclanrs
– elclanrs, Commented Dec 13, 2012 at 6:21
Sounds like you'd rather want an array of objects instead of an array of arrays of objects. — Felix Kling
– Felix Kling, Commented Dec 13, 2012 at 6:56

voithos · Accepted Answer · 2012-12-13 06:21:14Z

2

You set the attribute to a new array:

objA ['1'] = new Array();

So, of course, when you retrieve it, you're getting back an array.

var item = objA ['1'];

Arrays don't have a bird attribute. The first item in the array does, though.

alert(item[0]['bird']);

answered Dec 13, 2012 at 6:21

voithos

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techfoobar · Accepted Answer · 2012-12-13 06:20:52Z

2

You should use:

var item = objA ['1'][0];

When you do objA ['1'].push(..) you are appending an item to the array objA ['1'] - whose items should be referenced by index like objA ['1'][0], objA ['1'][1] etc..

answered Dec 13, 2012 at 6:20

techfoobar

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I29 · Accepted Answer · 2012-12-13 06:27:58Z

1

Always console.log(anything) for better understanding of the object. The following change was needed.

var item = objA ['1'][0];

http://jsfiddle.net/rpnzG/

answered Dec 13, 2012 at 6:27

I29

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