How to merge two arrays in javascript and keep unique values

How to merge two arrays in javascript and have unique values

function merge_array(array1, array2) {
    var result_array = [];
    var arr = array1.concat(array2);
    var len = arr.length;
    var assoc = {};

    while(len--) {
        var item = arr[len];

        if(!assoc[item]) 
        { 
            result_array.unshift(item);
            assoc[item] = true;
        }
    }

    return result_array;
}

function merge_array(array1, array2) {

var result_array = [];

var arr = array1.concat(array2);

var len = arr.length;

var assoc = {};

while(len--) {

var item = arr[len];

if(!assoc[item])

{

result_array.unshift(item);

assoc[item] = true;

}

return result_array;

}

Source: https://www.w3resource.com/javascript-exercises/javascript-array-exercise-30.php

How to merge two arrays in javascript and keep unique values

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