OP here!
Thanks a lot for your help, 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)..
Have a greet day!

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

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