myFunc.js

window.onload = function ()
{
  var print = Function("stringArg","document.write(stringArg)");
	var println = Function("stringArg","document.write(stringArg+'<br>')");
	
	var $int = Function("n","try{n = new Number(n);b = new Boolean(false);if( b !== n.isNaN ){Error.prototype.notInt = null;e = new Error();e.notInt = 'Invalid Type Error : ';document.body.innerText = e.notInt;}}catch(e){e.notInt;}return n");
	
	document.write( $int(10) );
	//document.write( $int('a') );
}