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Perl6 Cookbook 一時変数を使用しないで変数の値を交換する

Last updated at Posted at 2015-11-17

一時変数を使わずに、変数の値を交換する。

Perl6の環境構築についてはこちら。
Perl6導入とHello, world! - Qiita

スカラーの値の交換

Perl5
use v5.18;

my ( $a, $b, $c ) = qw( あ い う );
say $a, $b, $c; #=> あいう


( $a, $b, $c ) = ( $b, $c, $a );
say $a, $b, $c; #=> いうあ
Perl6
use v6;

my ( $a, $b, $c ) = <    >;
say $a, $b, $c; #=> あいう


( $a, $b, $c ) = $b, $c, $a ;
say $a, $b, $c; #=> いうあ

配列の値の交換

Perl5
use v5.18;

my @array = ( 6 .. 9 );
say @array; #=> 6789

@array[0,1,2,3] = @array[2,3,1,0];
say @array; #=> 8976
Perl6
use v6;

my @array = 6 .. 9;
@array.join.say; #=> 6789

@array[0,1,2,3] = @array[2,3,1,0];
@array.join.say; #=> 8976

ハッシュの値の交換

Perl5
use v5.18;

my %hash = (
'大空' => 'あかり',
'瀬名' => '',
);
say %hash;

@hash{'大空', '瀬名'} = @hash{'瀬名', '大空'};
say %hash;
Perl6
use v6;

my %hash = '大空' => 'あかり',
           '瀬名' => '';
%hash.kv.join.say;

%hash{'大空', '瀬名'} = %hash{'瀬名', '大空'};
%hash.kv.join.say;

参考や注釈

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