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<html> <body> <script type="text/javascript"> function StringBuffer () { this._strings_ = new Array(); } StringBuffer.prototype.append = function(str) { this._strings_.push(str); }; StringBuffer.prototype.toString = function() { return this._strings_.join(""); }; var buffer = new StringBuffer (); buffer.append("hello "); buffer.append("world"); var result = buffer.toString(); document.write(buffer); </script> </body> </html>