Determine whether an array contains a value [duplicate]

Question

I need to determine if a value exists in an array.

I am using the following function:

Array.prototype.contains = function(obj) {     var i = this.length;     while (i--) {         if (this[i] == obj) {             return true;         }     }     return false; } 

The above function always returns false.

The array values and the function call is as below:

arrValues = ["Sam","Great", "Sample", "High"] alert(arrValues.contains("Sam")); 

Answer 1

jQuery has a utility function for this:

$.inArray(value, array) 

Returns index of value in array. Returns -1 if array does not contain value.

See also How do I check if an array includes an object in JavaScript?