Comments on: Extending Objects in jQuery

By: Chris Missal

Chris Missal — Mon, 08 Oct 2012 16:16:00 +0000

You can modify it by accessing that object explicitly:

$.extend(obj.buttons.two, { ’name’: ’my new button’ });

In your code above, your property ‘two ‘ has a space in it, so you would actually have to change it to look like this:

$.extend(obj.buttons['two '], { ’name’: ’my new button’ });

By: Don

Don — Mon, 08 Oct 2012 15:49:00 +0000

How would you modify an interior object? Say you had a sequence of buttons like:

‘title’ : ‘Great Idea!’,
‘message’ : ‘You’re going to make a lot of money with this one!’, ‘buttons’ : {
‘one’ : {
‘name’ : ‘Yes’,
} ‘two ‘ : { ‘name’ : ‘No’, } ’three’ : { ’name’ : ‘Cancel’,

How would one modify the ‘name’ property of button ‘two’ using extend?

By: Andrej Fiser

Andrej Fiser — Thu, 04 Oct 2012 11:09:00 +0000

Maybe you should also mention that the first object (start) is modified and returned. To keep the original start intact you would use
var extended = $.extend({}, start, more, extra);

By: Extending Objects in Dojo | Chris Missal's Blog

Extending Objects in Dojo | Chris Missal's Blog — Wed, 03 Oct 2012 21:10:59 +0000

[...] works a bit differently than we saw with jQuery and ExtJS. They have the notion of extend as well as mixin. These both behave differently, not only [...]

By: Chris Missal

Chris Missal — Tue, 02 Oct 2012 06:19:00 +0000

The individual items contained within the array will not be merged. The entire array “overwrites” the previous value. In the example above, the start object has a property “values” containing an array with 7 integers. When extended with the “extra” object, the new value is now an array of 4 integers”.

By: Kassem Darwish

Kassem Darwish — Tue, 02 Oct 2012 06:12:00 +0000

Very nice. But could you elaborate on the last part (the one that talks about extending an array) of the article please?

By: Henry Ho

Henry Ho — Fri, 28 Sep 2012 19:58:00 +0000

Question: should one use $.extend or _.extend?

JSPref indicates $.extend is faster: http://jsperf.com/underscore-extend-performance-test/5

By: Nick Williams

Nick Williams — Fri, 28 Sep 2012 12:16:00 +0000

My favourite use case for this is overlaying function arguments with default values, especially in jQuery plugins.

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The Morning Brew - Chris Alcock » The Morning Brew #1199 — Fri, 28 Sep 2012 08:35:42 +0000

[...] Extending Objects in jQuery – Chris Missal kicks off a series of posts looking at extending objects in different JavaScript Frameworks. This post explores how you go about doing this usign jQuery [...]

By: Extending Objects with JavaScript | Chris Missal's Blog

Extending Objects with JavaScript | Chris Missal's Blog — Fri, 28 Sep 2012 03:03:56 +0000

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