sformat.js

/*
sformat(str, arg1, arg2, etc..)

USAGE:
==============================================================
sformat("{0}", "test");                  //returns test
sformat("{{0}}");                        //returns {0}
sformat("{{{0}}}", "test");              //returns {test}
sformat("{0} {0}", "test");              //returns test test
sformat("{0} {1}", "first", "second");   //returns first second
sformat("{1} {0}", "second", "first");   //returns first second
*/

var sformat = (function() {
  var pattern = /\{\{|\}\}|\{(\d+)\}/g;
  return function () {
    var parameters = arguments;
    return parameters[0].replace(pattern, function (match, group) {
      var value;
      if (match === "{{") {
        return "{";
      }
      if (match === "}}") {
        return "}";
      }
      value = parameters[parseInt(group, 10) + 1];
      return value ? value.toString() : "";
    });
  };
})();