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    <p>You could look at either jQuery's or Prototypes <a href="http://docs.jquery.com/Utilities/jQuery.extend" rel="noreferrer">extend</a> functionality.</p> <p>It looks like this: (taken directly from jQuery)</p> <pre><code>jQuery.extend = jQuery.fn.extend = function() { // copy reference to target object var target = arguments[0] || {}, i = 1, length = arguments.length, deep = false, options; // Handle a deep copy situation if ( typeof target === "boolean" ) { deep = target; target = arguments[1] || {}; // skip the boolean and the target i = 2; } // Handle case when target is a string or something (possible in deep copy) if ( typeof target !== "object" &amp;&amp; !jQuery.isFunction(target) ) target = {}; // extend jQuery itself if only one argument is passed if ( length == i ) { target = this; --i; } for ( ; i &lt; length; i++ ) // Only deal with non-null/undefined values if ( (options = arguments[ i ]) != null ) // Extend the base object for ( var name in options ) { var src = target[ name ], copy = options[ name ]; // Prevent never-ending loop if ( target === copy ) continue; // Recurse if we're merging object values if ( deep &amp;&amp; copy &amp;&amp; typeof copy === "object" &amp;&amp; !copy.nodeType ) target[ name ] = jQuery.extend( deep, // Never move original objects, clone them src || ( copy.length != null ? [ ] : { } ) , copy ); // Don't bring in undefined values else if ( copy !== undefined ) target[ name ] = copy; } // Return the modified object return target; }; </code></pre>
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    1. POHow can I merge 2 javascript objects, populating the properties in one if they don't exist in the other?
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    1. UScgp
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    1. COSeems an awful lot of work to perform some deep copy magic - is it really necessary?
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      1. USTML
    2. COThat's a good question, the deep copy stuff could be overkill.
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      1. UScgp
    3. COThat's not the code you need to write, that's what the extend function looks like, all I had to do was options = $.extend(defaults, options)
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      1. USGlenn Slaven
 

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