How to merge two arrays in JavaScript and de-duplicate items

Question

I have two JavaScript arrays:

var array1 = ["Vijendra","Singh"];
var array2 = ["Singh", "Shakya"];

I want the output to be:

var array3 = ["Vijendra","Singh","Shakya"];

The output array should have repeated words removed.

How do I merge two arrays in JavaScript so that I get only the unique items from each array in the same order they were inserted into the original arrays?

Answer 1

Use:

Array.prototype.merge = function (arr) {
    var key;
    for(key in arr) 
        this[key] = arr[key];
};