How can I check if a lua table contains only sequential numeric indices?

Question

How can I write a function that determines whether it\'s table argument is a true array?

isArray({1, 2, 4, 8, 16}) -> true
isArray({1, \"two\", 3, 4, 5}) ->         


        

Answer 1

Iterate from 0 to the number of elements, and check if all elements with the counter's index exist. If it's not an array, some indexes will miss in the sequence.