in reply to Is there a simple syntax to logically slice a hash?

I tend to do:

my %h2; /^cat/ and $h2{ $_ } = $h1{ $_ } for keys %h1;

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Which might be seen as "cheating" as a one-liner; but it is often difficult to put the initialisation of a hash inline.

It is also quite more efficient than map and/or grep for larger hashes, by avoiding the creation of intermediate lists.

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