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ハッシュと向き合った
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#! /usr/bin/perl | |
use strict; | |
use warnings; | |
use 5.010; | |
my $n = "\n"; | |
my %hash = ("foo", 35, "bar", 12.4, 2.5, "hello"); | |
say $_ foreach (%hash); | |
print $n; | |
my %hash2 = ("foo" => "test", "hello" => "banana", "Night" => "Sleep", "Morning" => "Yahoo!"); | |
say $_ foreach (%hash2); # 要素順に行う訳ではない | |
my @keys = keys %hash2; # 要素順に格納される訳ではない | |
my @values = values %hash2; # 要素順に格納される訳ではない | |
print $n; | |
say $_ foreach (@keys); | |
print $n; | |
say $_ foreach (@values); | |
print $n; | |
# each という関数がある。 | |
# これは主にこのような形で考える | |
# もちろん要素順に行う訳ではない | |
while (my ($key, $value) = each %hash2){ | |
say "$key => $value"; | |
} | |
print $n; | |
print "PATH is $ENV{PATH}\n"; # %ENV ハッシュ | |
= | |
result | |
bar | |
12.4 | |
foo | |
35 | |
2.5 | |
hello | |
hello | |
banana | |
Morning | |
Yahoo! | |
foo | |
test | |
Night | |
Sleep | |
hello | |
Morning | |
foo | |
Night | |
banana | |
Yahoo! | |
test | |
Sleep | |
hello => banana | |
Morning => Yahoo! | |
foo => test | |
Night => Sleep | |
PATH is /usr/local/share/python:/Users/codehex/.rbenv/shims:/Users/codehex/.plenv/shims:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin:/usr/texbin | |
=cut |
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