What version of perl are you using? I believe map was optimized recently. Previously it was slower than foreach.

generally speaking, I use map if I care about the return array, foreach if I don't (void context)

Perhaps you could try tr/0/./? I believe that should be faster than s///.

In reply to Re: When should I use map, for? by Transient
in thread When should I use map, for? by radiantmatrix

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