What is the best way to delete strings in a string list that that match certain pattern?
Diez B. Roggisch
deets at nospam.web.de
Fri Nov 6 10:05:30 CET 2009
Peng Yu schrieb:
> Suppose I have a list of strings, A. I want to compute the list (call
> it B) of strings that are elements of A but doesn't match a regex. I
> could use a for loop to do so. In a functional language, there is way
> to do so without using the for loop.
Nonsense. For processing over each element, you have to loop over them,
either with or without growing a call-stack at the same time.
FP languages can optimize away the stack-frame-growth (tail recursion) -
but this isn't reducing complexity in any way.
So use a loop, either directly, or using a list-comprehension.
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