I didn't know that map could be used such a way (i.e. having an output instead of altering every item in a list)

Erm, that is what map is for! :) Perl::Critic even provides a ProhibitVoidMap policy to warn you of code that uses map in void context.

I suggest you follow the simple stylistic advice given in Effective Perl Programming in the item "Use foreach, map and grep as appropriate" namely:

• Use foreach to iterate read-only over each element of a list
• Use map to create a list based on the contents of another list
• Use foreach to modify elements of a list
• Use grep to select elements in a list

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