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var a=['a','b','c'],b=['c',1,2];
var arr=a.concat(b);
console.log(arr);// ["a", "b", "c", "c", 1, 2]
var arr2 = arr.filter((item,index) => 
    index ===arr.lastIndexOf(item)
);
console.log(arr); // ["a", "b", "c", "c", 1, 2]
console.log(arr2); // ["a", "b", "c", 1, 2]
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JacobHsupro
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