JSFiddle - React, Tailwind, and code Playground

JavaScript

Array.prototype.unique = function () {
    var r = new Array();
    o:for(var i = 0, n = this.length; i < n; i++)
    {
        for(var x = 0, y = r.length; x < y; x++)
        {
            if(r[x]==this[i])
            {
                continue o;
            }
        }
        r[r.length] = this[i];
    }
    return r;
}
    var array1 = [34,35,45,48,49];
    var array2 = [34,35,45,48,49,55];
    alert(array1.concat(array2).unique());