Prototypal Methods: Creating a new inherited method in the String prototype

gistfile1.txt

String.prototype.checkFor = function (input) {
            var result = 0;
            for (var i = 0; i<this.length; i++) {//use this to check for the length of the actual string
                        this.charAt(i) == input ? result++ : false;  //we can use a ternary conditional here.
            }
            return result;
};

console.log("This is a good string".checkFor("o")); //Now we can use the new method on a string and log it out.