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    <p>It doesn't just support minification, it can also be used in closures. When you're creating functions, for example to use in a callback, you have to take care of what "this" is when the function is called. A common mistake when starting out in Javascript is to get the wrong 'this'. The "var me = this" pattern helps to avoid that. For example</p> <pre><code>function doSomething() { var me = this; callSomethingAsynchronous(42, function (result) { // Here 'this' will depend on the caller of the callback functon. me.theResult = result; }); } </code></pre> <p>Note that frameworks like Ext discourage this and have you pass the scope variable along with the callback. </p> <pre><code>callSomethingAsynchronous(42, me.handlerFunction, me); </code></pre> <p>It allows you do leave the definition of the handlerFunction on the prototype rather than keep creating them. Sometimes a closure is just the better way because you have to enclose information that is only known at runtime</p> <pre><code>function sayHelloInAContrivedWay (name) { getTheGreetingAsync(function (greeting) { console.log(greeting + name); }); } </code></pre> <p>I use "var me = this" whenever I'm accessing this more than once in a function. The minifier does reduce it to a single character. If I'm accessing a child object I'll create a var for that too</p> <pre><code>function keepInnerWombatFit () { var me = this, wombat = me.inner.wombat; wombat.run(); wombat.jump(); wombat.sitDown(); me.excerciseCount++; } </code></pre> <p>I've seen code with huge nested accesses typed out (or cut and pasted) again and again and again, which cannot be minified, may cost a little performance and is harder to read and maintain.</p> <pre><code>this.inner.wombat.run(); this.inner.wombat.jump(); this.inner.wombat.sitDown(); </code></pre>
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    1. POIs me = this in JavaScript a good practice to support minification?
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    1. USRichard Corfield
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