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POCan JQuery $.extend be used with indexing?
 

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  1. POCan JQuery $.extend be used with indexing?
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    <p>I am trying to extend an Object of the following structure (with JQuery in Coffeescript): </p> <pre class="lang-coffee prettyprint-override"><code>objectThatIsAList = { 'List Item' : callback :=&gt; return "Some value" 'Another item' : callback :=&gt; return "Another value" 'The final item' : callback :=&gt; no } </code></pre> <p>This Object is used as a (dynamic) model for a dropdown menu in a large coffeescript-based framework. </p> <p>I am extending it with </p> <pre class="lang-coffee prettyprint-override"><code>objectThatIsAList = $.extend {}, objectThatIsAList, { 'New Item' : callback :=&gt; return "New stuff" } </code></pre> <p>This results in an Object like this (comments added to show intended outcome)</p> <pre class="lang-coffee prettyprint-override"><code>objectThatIsAList = { 'List Item' : callback :=&gt; return "Some value" 'Another item' : callback :=&gt; return "Another value" # this should be last 'The final item' : callback :=&gt; no # this should not be last 'New Item' : callback :=&gt; return "New stuff" } </code></pre> <p>Obviously, the object gets extended correctly, however the order of properties is relevant for the purpose of building a list. <strong>I'd much rather want the <code>'Final Item'</code> as the fourth and not the third property</strong> of the extended Object. </p> <p>But my research did not show indexing support for the <code>$.extend</code> method. Has anyone successfully implemented such a feature and/or has tips how to go about 'inserting' object properties into another object at a certain position?</p> <p>Or is there a clever way to reposition that final item after the <code>$.extend</code>?</p> <p>Does not necessarily have to be Coffee, even JS or Pseudocode would be of great help. </p> <p><strong>EDIT:</strong></p> <p>This is the solution that i have come up with that extends the legacy code to take arrays and convert them to objects (that are being used extensively all over the framework and where changing the original code would break alot of working code):</p> <pre class="lang-coffee prettyprint-override"><code># this comparison yields a data object that is passed to a method rendering a menu if o.menu instanceof Array menuArrayToObj = {} for menuObject in o.menu for menuObjectProperty,menuObjectValue of menuObject menuArrayToObj[menuObjectProperty]=menuObjectValue if menuObjectProperty? and menuObjectValue? o.menu = menuArrayToObj else o.menu </code></pre> <p>With this in place, it can either be fed an object or a array. The latter is easily inserted into with splice. </p>
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    1. USarvidkahl
    1. USarvidkahl
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    1. COHow do you expect to index an _object_? Ordering of JS Object properties is undefined by design.
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      1. POCan JQuery $.extend be used with indexing?
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    2. COThat's the problem I'm facing or rather trying to circumvent. The menu-generating method that I am interfacing with is not equipped to use arrays to build it's output (and that's bad, but for now unchangeable), so I am trying to find a way to have my cake and eat it too. Until now, there was no need to have this functionality because the menus were completely "designed" on creation, but I am adding a dynamic element to the functionality. I am aware that redesigning the original code is the proper way to do it, but I am looking for a (rather dirty) way to prototype this without changing legacy.
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      1. POCan JQuery $.extend be used with indexing?
      1. USarvidkahl
    3. CO@arvidkahl seriously, redesign your menu code now while you have the chance. Just because on _some_ browsers elements happen to be enumerated in the order they were inserted, doesn't mean all browsers will. For all you know, on some browsers the items will come up in reverse order, or in some random order. The _only_ way to guarantee order is to use an ordered array.
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      1. USAlnitak
 

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