Re^3: map question (hash slice)

> Of course, this assumes string values.

Not assuming it is why I went this way. It can also handle an array of refs like this.

Though mixed values may clash.

I started a thread here once where I asked for a solution for this, will dig it out tomorrow.

update

couldn't wait Re: Using hashes for set operations... , but doesn't really help.

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery
FootballPerl is like chess, only without the dice}

Comment on Re^3: map question (hash slice)

Replies are listed 'Best First'.
Re^4: map question (hash slice) by ikegami (Patriarch) on Jul 29, 2019 at 05:51 UTC
Except your code assumes strings too. For "objects", you'd need `my %required; @required{ map key($_), @required } = @required; delete @required{ map key($_), @got }; warn "Skipper is missing: ", values %required;` [download] Where `key` is a suitable key-producing sub.	[reply] [d/l] [select]
Re^5: map question (hash slice) by LanX (Saint) on Jul 30, 2019 at 12:21 UTC
> For "objects", you'd need No not if the array has only refs. Collision can only happen if a string looks like a string representation of a ref. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply]
Re^6: map question (hash slice) by ikegami (Patriarch) on Jul 31, 2019 at 06:17 UTC
Maybe. Depends on whether you are checking for identity or equality. If you are checking for identify, then yeah, the `key` sub could simply return its argument, giving your original code. So my comment stands. Your solution is a specific case of my code that only works if one makes multiple assumptions.	[reply] [d/l]
Re^5: map question (hash slice) by LanX (Saint) on Jul 30, 2019 at 00:50 UTC
Well, I have the impression a little tweak on the C-sources to add a little magic onto ref-stringification would be enough to implement native set operations. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply]