With arrays, do you HAVE to refer to the last or second to last item with -1?

Question

I tried to call for the false by putting in 4 instead of - 1 like in the example, but it suddenly didn't work... why?

arr = [5, "Dave", 15.88, false]

puts arr[0] #5
puts arr[1] #"Dave"
puts arr[4] #false

Answer 1

The size of the array is 4
But the index starts at 0
So 0 is 5, ¹ is "Dave", 2 is 15.88 and 3 is false
To get false, use arr[3]
[Edit] fixed typo

Answer 2

@AJ Oops, it was a typo. Fixed now, thanks

Answer 3

Oh right I forgot, wait you mean the index starts at 0 right?

Answer 4

thank you