How to check if an element exists in an array in Javascript

27 Dec 2014

The below function can efficiently check whether an element exists in the array or not

if (!Array.prototype.elemetExists) {
    Array.prototype.elemetExists = function (string) {
        return !!~this.indexOf(string);
    };
}

//usage 
var fruits = ['Apple' , 'Banana' , 'Orange' , 'Mango'];
console.log(fruits.elemetExists('Banana'));  //true 
console.log(fruits.elemetExists('Lichi'));  //false