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copied!<p>Off the top of my head...</p> <p><strong>Functions</strong></p> <p>arguments.callee refers to the function that hosts the "arguments" variable, so it can be used to recurse anonymous functions:</p> <pre><code>var recurse = function() { if (condition) arguments.callee(); //calls recurse() again } </code></pre> <p>That's useful if you want to do something like this:</p> <pre><code>//do something to all array items within an array recursively myArray.forEach(function(item) { if (item instanceof Array) item.forEach(arguments.callee) else {/*...*/} }) </code></pre> <p><strong>Objects</strong></p> <p>An interesting thing about object members: they can have any string as their names:</p> <pre><code>//these are normal object members var obj = { a : function() {}, b : function() {} } //but we can do this too var rules = { ".layout .widget" : function(element) {}, "a[href]" : function(element) {} } /* this snippet searches the page for elements that match the CSS selectors and applies the respective function to them: */ for (var item in rules) { var elements = document.querySelectorAll(rules[item]); for (var e, i = 0; e = elements[i++];) rules[item](e); } </code></pre> <p><strong>Strings</strong></p> <p><em>String.split</em> can take regular expressions as parameters:</p> <pre><code>"hello world with spaces".split(/\s+/g); //returns an array: ["hello", "world", "with", "spaces"] </code></pre> <p><em>String.replace</em> can take a regular expression as a search parameter and a function as a replacement parameter:</p> <pre><code>var i = 1; "foo bar baz ".replace(/\s+/g, function() {return i++}); //returns "foo1bar2baz3" </code></pre>

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