"Strong typing vs. strong testing"

TheFlyingDutchman zzbbaadd at aol.com
Thu Sep 30 08:09:05 CEST 2010


>
> That argument can be made for dynamic language as well. If you write in
> dynamic language (e.g. python):
>
> def maximum(a, b):
>     return a if a > b else b
>
> The dynamic language's version of maximum() function is 100% correct --
> if you passed an uncomparable object, instead of a number, your call of
> it is incorrect; you just didn't pass the right sort of data. And that's
> your problem as a caller.
>
> In fact, since Python's integer is infinite precision (only bounded by
> available memory); in practice, Python's version of maximum() has less
> chance of producing erroneous result.

"in C I can have a function maximum(int a, int b) that will always
work. Never blow up, and never give an invalid answer. "

Dynamic typed languages like Python fail in this case on "Never blows
up".



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