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    <p>This setter approach cannot work. No matter what the function returns, if you use a function call as sole expression left-hand side (LHS) of an assignment expression, you are getting</p> <blockquote> <p>ReferenceError: Invalid left-hand side in assignment</p> </blockquote> <p>and the like. As the others have said, you are not seeing the <code>ReferenceError</code> exception because it is caught as it is being thrown and there is no code to handle it. Functions are first-class objects, but <em>calls</em> to them are <em>not</em> <a href="http://ecma-international.org/ecma-262/5.1/#sec-11.13.1" rel="nofollow">valid LHS values</a>. You will see that clearly if you insert <code>console.log(e);</code> in the <code>catch</code> block.</p> <p>This getter approach can work. However, if you want getters and setters, at the latest in a conforming implementation of ECMAScript Edition 5 <a href="http://ecma-international.org/ecma-262/5.1/#sec-15.2.3.6" rel="nofollow">you can have that natively</a>:</p> <pre><code>Object.defineProperty(props, "name", (function () { var _value; return { set: function (value) { /* setter code, simple example */ _value = String(value); }, get: function () { /* getter code, simple example */ return _value; } }; }())); /* triggers the setter */ props.name = 42; /* triggers the getter */ var x = props.name; /* "42" */ x </code></pre> <p>“Edit 2” –</p> <pre><code>var someObjs = [{a:"",someProp:"b"}]; (function (a) { return someObjs[a]})(0).someProp = "c"; console.log(someObjs[0].someProp); </code></pre> <p>– works because the return value of the function is used LHS, but as part of <em>another</em> expression that evaluates to a <em>property access</em> (using the dot property accessor syntax). The function returns <em>a reference to an object</em> (to an <code>Object</code> instance) whose property is then accessed. The property access being the LHS of an assignment expression, the RHS value (<code>"c"</code>) is assigned to that property.</p> <p>It is functionally equivalent to</p> <pre><code>var someObjs = [ {a: "", someProp: "b"} ]; (function () { return someObjs[0]; }()).someProp = "c"; console.log(someObjs[0].someProp); </code></pre> <p>and therefore to</p> <pre><code>someObjs[0].someProp = "c"; console.log(someObjs[0].someProp); </code></pre> <p>(as you can see, good code style helps a lot with understanding code)</p>
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    1. POProperty Bag in javascript
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    1. USPointedEars
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    1. COThanks for your breakdown PointedEars. I'm planning on getting more context tomorrow and hopefully that'll help me understand if this is indeed what is happening.
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