terface._ttyWrite (readline.js:760:14)
at ReadStream.onkeypress (readline.js:99:10)
at ReadStream.EventEmitter.emit (events.js:98:17)
at emitKey (readline.js:1095:12)</pre>
</div>
<p>
<b>Note</b>: In ECMAScript 5 there is no concept for classes. Instead each function can be used as a constructor function which is executed by the 'new' operator. Furthermore, during construction the key property <code>prototype</code> of the constructor function is used to attach a prototype instance to the created object. A 