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

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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?

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