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Better Javascript Trim

01.14.2009
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        Taken from http://blog.stevenlevithan.com/archives/faster-trim-javascript

function trim (str) {
    var str = str.replace(/^\s\s*/, ''),
              ws = /\s/,
              i = str.length;
    while (ws.test(str.charAt(--i)));
    return str.slice(0, i + 1);
}