Check if value is in Array

inArray.js

Array.prototype.inArray = function (value) {
    var i;
    for (i=0; i < this.length; i++) {
        if (this[i] === value) {
            return true;
        }
    }
    return false;
};

//[1,2,3].inArray(2) > true
//[1,2,3].inArray(22) > false