my trim script vs google closure compiled version

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My Trim Inclusion
if (!String.prototype["trim"]) {
 String.prototype["trim"] = function() {
  return this.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
 };
}
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Google Closure Compiled Inclusion
String.prototype.trim || (String.prototype.trim = function() {
 return this.replace(/^\s\s*/, "").replace(/\s\s*$/, "")
});
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