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I find true module to be an insanely useful operator. Python negative indexing (array[-1]) is essentially that. I’ve proposed it to swift but people didn’t see

• tlb 8y ago
  But you want array[len(array)] to throw an error rather than return array[0], so modulo isn't the right operator.
• Shoop 8y ago
  Python negative indexing isn't modulo. It's just shorthand for array[len(array)-i]. >>> a = [1, 2, 3] >>> a[-1] 3 >>> a[-2] 2 >>> a[-3] 1 >>> a[-4] Traceback (most recent call last): File "<stdin>", line 1, in <module> IndexError: list index out of range
  • adamnemecek 8y ago
    The problem is that you need to have a conditional to figure out if I is negative or not. With modulo it’s all the same.