Re^2: can I change hash keys or values directly


Syntactic Confectionery Delight
	PerlMonks

Re^2: can I change hash keys or values directly

by misterperl (Pilgrim)

on Jan 29, 2021 at 14:27 UTC ( [id://11127637]=note: print w/replies, xml )

Need Help??

in reply to Re: can I change hash keys or values directly
in thread can I change hash keys or values directly

I appreciate the replies guys. I guess I was already on the best approach using the slice. The link to "values" and it's helpful to know that they be operated on directly. I tried it

map s.(\d+).$1+1/e,values %nums;
[download]

which worked great. Love it. Helpful & useful. TYVM

If I'm reading that right, it does appear from that link that as an experiment, perhaps keys also worked that way for some brief Perl versions:

 
use 5.012;  # so keys/values/each work on arrays
[download]

Comment on Re^2: can I change hash keys or values directly Select or Download Code

Replies are listed 'Best First'.

Re^3: can I change hash keys or values directly
by choroba (Cardinal) on Jan 29, 2021 at 22:44 UTC

> perhaps keys also worked that way

No, it means you can write

#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

use Syntax::Construct qw{ keys-array };  # More explicit than 5.012.

my @array = qw( abc def );

my @keys = keys @array;      # 0, 1
my @values = values @array;  # abc, def
while (my ($index, $value) = each @array) {
    say "$index $value";     # 0 abc, 1 def
}
[download]

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

[reply]
[d/l]
[select]

In Section Seekers of Perl Wisdom