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2012-10-09T18:18:14.657
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2012-10-09T18:49:13.360
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Unlike many C-style languages, JavaScript supports block syntax but does not support block scope, so the following may not run as you would expect: <pre><code>var foo = 'bar'; { var foo = 'baz'; } console.log(foo); // 'baz' </code></pre> This is also evident in other JavaScript constructs that support blocks like <code>if</code>: <pre><code>var foo = 'bar'; if (true) { var foo = 'baz'; } console.log(foo); // 'baz' </code></pre> Moreover, as Bergi pointed out, your <code>i</code> counters for <code>for</code>s will override each other because a <code>for</code> will not create a new scope. Crockford considers JavaScript's lack of block scope an <a href="http://rads.stackoverflow.com/amzn/click/0596517742" rel="nofollow">"Awful Part"</a> of the language. Instead, JavaScript has <a href="http://en.wikipedia.org/wiki/Lexical_scoping#Lexical_scoping_and_dynamic_scoping" rel="nofollow">lexical scoping</a>, so only functions will create a new scope: <pre><code>var foo = 'bar'; (function() { var foo = 'baz'; console.log(foo); // 'baz' }()); console.log(foo); // 'bar' </code></pre> Every function in JavaScript has access to the variables in the function that contains it; inner has access to outer, but not vice versa. In the case of the above example, the <a href="http://benalman.com/news/2010/11/immediately-invoked-function-expression/" rel="nofollow">IIFE</a> (immediately-invoked function expression) has access to the <code>foo = 'bar';</code> defined in the global scope, but instead we choose to override <code>foo</code> with a local <code>var</code> declaration and set it equal to <code>'baz'</code>. Bonus Point: Shog9 found that <code>with</code> can simulate block scope with an object literal like so: <pre><code>var foo = 'bar'; with ({foo: 'baz'}) { console.log(foo); // 'baz' } console.log(foo); // 'bar' </code></pre> Crockford <a href="http://yuiblog.com/blog/2006/04/11/with-statement-considered-harmful/" rel="nofollow">discourages <code>with</code></a> due to its ambiguity, but if you really desire block scope, I see no harm in the <code>with</code> workaround.
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1. POSimple Points on Variable Scope - Javascript
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