Extending JavaScript Strings with LINQ Style Contains Method

Similar to my previous post about extending JavaScrpt arrays to include a shuffle method... Any JavaScript object can be extended using the prototype object.  The following line of code deomonstrates how to extend JavaScript string objects to include a LINQ style contains method.  The function will return true if the string contains the input, or false, if it does not.

String.prototype.contains = function(input) {
     return ~this.indexOf(input)
}

var rickLeitch = "Rick Leitch";

if(rickLeitch.contains("ck Le")) {
     // Do Stuff
}