[Haskell-cafe] list comprehansion performance has hug different
artyom.kazak at gmail.com
Tue Jan 29 11:33:58 CET 2013
Junior White <efiish at gmail.com> писал(а) в своём письме Tue, 29 Jan 2013
> So this is a problem in lazy evaluation language, it will not appear in
> python or erlang, am i right?
Not quite. Compilers of imperative languages don’t perform CSE (common
subexpression elimination) either; `queens' (k-1)` could have some side
effects, after all, and performing a side effect only once instead of n
times is a definite bug.
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