Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

JavaScript

function mix(first_arr, second_arr) {
    for(i = 0; i < second_arr.length; i++) {
        if(first_arr.indexOf(second_arr[i]) == -1) {
            first_arr.push(second_arr[i]);
        }
    }
    return first_arr;
}

Final = [ 1, 2, 3, 4, 5, 6, 7 ]
ya = [ 2 , 8, 7, 9, 10, 11, 12 ]

alert(mix(Final, ya))

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JSFiddle - React, Tailwind, and code Playground

JavaScript

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Use pre-released features

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