JavaScript Extensions (String.Format)

JsStringExtensions.js

/* Format strings in JavaScript
 * Usage: 
 *  > "Hello {0}!".format('Safeer'); // Hello Safeer!
 *
 *  > var str = "{0} is one of the most popular programming languages in the world. \
 *               This {1} contains some extension methods that can be used in your {0} code.";
 *    str.format('JavaScript', 'Gist');
 *
 */
String.prototype.format = function() {
    var str = this;

    for (var i = 0; i < arguments.length; i++) {
        var placeHolderRegExp = RegExp('(\{)' + i + '(\})', 'gm');
        str = str.replace(placeHolderRegExp, arguments[i]);
    }

    return str + '';
}