in reply to Re^2: One-liner to join keys on a two-dimensionnal hash ?
in thread One-liner to join keys on a two-dimensionnal hash ?
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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