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POJavascript automatic getter/setters (John Resig Book)
 

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    <p>I'm reading "<a href="http://jspro.org/" rel="noreferrer">Pro Javascript Techniques</a>" from John Resig, and I'm confused with an example. This is the code:</p> <pre><code>// Create a new user object that accepts an object of properties function User( properties ) { // Iterate through the properties of the object, and make sure // that it's properly scoped (as discussed previously) for ( var i in properties ) { (function(){ // Create a new getter for the property this[ "get" + i ] = function() { return properties[i]; }; // Create a new setter for the property this[ "set" + i ] = function(val) { properties[i] = val; }; })(); } } // Create a new user object instance and pass in an object of // properties to seed it with var user = new User({ name: "Bob", age: 44 }); // Just note that the name property does not exist, as it's private // within the properties object alert( user.name == null ); // However, we're able to access its value using the new getname() // method, that was dynamically generated alert( user.getname() == "Bob" ); // Finally, we can see that it's possible to set and get the age using // the newly generated functions user.setage( 22 ); alert( user.getage() == 22 ); </code></pre> <p>Now running that on Firebug console (on FF3) throws that user.getname() is not a function. I tried doing this:</p> <pre><code>var other = User other() window.getname() --&gt; this works! </code></pre> <p>And it worked!</p> <p>Any idea why? thanks everybody!</p> <p>PS: I strongly recommend this book.</p> <p><strong>EDIT:</strong></p> <p>doing:</p> <pre><code>var me = this; </code></pre> <p>seems to work a bit better, but when executing "getname()" it returns '44' (the second property)...</p> <p>also I find it strange that it worked on the window object without modification...</p> <p>and a third question, what's the difference between PEZ solution and the original? (he doesn't use an anonymous function)</p> <p>Thanks to everyone for the feedback! +1</p>
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    1. COI generally try to make code as simple as it can be. Thus I removed the anonymous function stuff where I didn't think it was needed.
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