I don't understand length resulting from 2 set objects sum

Question

Why by adding two objects with length 2 each one, the length of the result is 6, shouldn't it be 3?

var nums1 = [1,2]; // length is 2
var nums2 = [3,4]; // length is 2 too
var set = nums1 + nums2; //set is [1,23,4]
console.log(set.length) // output is 6! why??

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Answer 1

when you add nums1 and nums2 then it becomes string "1,23,4" not array so the length of this string is 6 (including commas)

Answer 2

Now I see!! Thanks a lot VEDANG!!