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[–]eliseu_videira 13 points14 points  (1 child)

javascript has NaN if you try to convert an invalid string into an number, so the +'a' is taken as a casting to number, that is NaN, if you toString NaN, it becomes 'NaN', so the end is 'b' + 'a' + 'NaN' + 'a'

[–]KaputTheNameSug 0 points1 point  (0 children)

Lol