camel

鐃熟てぶ件申由鐃緒申Charsbar鐃緒申鐃藷かわ申鐃緒申摘鐃緒申鐃所。

[鐃緒申] not defined 鐃夙ヒワ申鐃宿ワ申鐃緒申鐃緒申鐃�
鐃塾はわ申鐃緒申鐃緒申辰討鐃緒申鐃緒申里任鐃緒申鐃緒申鐃緒申鐃�use warnings鐃竣わ申箸鐃緒申呂瓩随申蕁� 鐃駿刻申 ("Use of uninitialized value ...") 鐃緒申鐃出わ申茲�鐃祝なっわ申鐃塾で￥申 鐃緒申鐃縦わ申鐃緒申鐃緒申討鐃緒申鐃塾でわ申鐃縦￥申

鐃緒申鐃緒申泙鐃�Perl鐃緒申鐃緒申鐃緒申鐃叔わ申TMTOWTDI鐃緒申鐃出削申鐃緒申鐃緒申鐃緒申里鐃緒申鐃緒申鼻鐃緒申鐃緒申鐃緒申鐃緒申鐃淑のでわ申鐃緒申鐃叔わ申鐃緒申鐃出削申鐃緒申泙箸鐃銃わ申鐃緒申鐃殉わ申鐃緒申

no warnings 'uninitialized';

鐃緒申鐃曙が鐃緒申鐃瞬器申鐃緒申的鐃緒申鐃出削申鐃祝なわ申泙鐃緒申鐃�Scope単鐃縮わ申有鐃緒申鐃緒申pragma鐃淑ので￥申

use warnings; 
sub foo{
  no warnings 'uninitialized';
  # 鐃緒申鐃緒申鐃熟緒申鐃緒申鐃緒申鐃緒申鐃�
}
# 鐃緒申鐃緒申鐃熟緒申鐃緒申鐃緒申鐃宿�鐃竣わ申鐃緒申

鐃夙なわ申泙鐃緒申鐃緒申鐃緒申鐃緒申箸鐃緒申討蓮鐃緒申鐃緒申鐃緒申鐃緒申鐃銃わ申鐃殉わ申鐃緒申鐃夙￥申warnings鐃緒申trap鐃緒申鐃緒申鐃淳わ申鐃緒申鐃術随申鐃殉わ申鐃出象わ申鐃初外鐃緒申鐃銃わ申鐃殉わ申鐃緒申鐃夙わ申鐃緒申鐃緒申鐃緒申鐃殉わ申鐃緒申

my $arg = shift || default_value

鐃緒申鐃熟で使わ申鐃緒申隋�鐃緒申鐃曙が鐃叔わ申櫂團鐃初ー鐃緒申鐃緒申鐃塾わ申泙鐃緒申鐃�

use warnings; 
sub foo{
  my $required = shift;       # 必鐃緒申鐃緒申鐃所し鐃緒申鐃淳わ申鐃緒申鐃塾でデフワ申鐃緒申鐃緒申佑六鐃緒申蠅件申覆鐃�
  my $optional = shift || 42; # 鐃緒申鐃所が鐃淑わ申鐃曙た鐃緒申妊侫鐃緒申鐃緒申鐃粛わ申箸鐃�
  # ...
}

鐃巡自鐃夙￥申鐃緒申鐃瞬使わ申鐃塾わ申鐃緒申鐃緒申任鐃緒申鐃�

sub foo{
  my ($required, $optional) = @_:
  $optional ||= 42;
  # ...
}

鐃叔わ申同鐃粛の醐申鐃縮わ申鐃緒申鐃緒申鐃緒申鐃緒申任鐃緒申泙鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申亮鐃祝￥申砲楼鐃緒申鐃緒申鐃所が鐃緒申鐃獣て￥申鐃緒申鐃緒申的鐃緒申''鐃緒申0鐃緒申有鐃緒申鐃緒申鐃粛とわ申鐃緒申鐃緒申鐃緒申鐃殉でデフワ申鐃緒申鐃緒申佑能鐃緒申鐃緒申鐃緒申討鐃緒申泙鐃緒申里任鐃緒申鐃緒申鐃緒申鐃緒申鐃宿わ申鐃祝わ申

sub foo{
  my ($required, $optional) = @_:
  $optional = 42 unless defined $optional;
}

鐃夙わ申鐃淑わ申鐃緒申个覆鐃淑わ申鐃緒申鐃銃￥申||=鐃緒申箸鐃緒申鐃祝￥申鐃緒申鐃緒申鐃楯でわ申鐃緒申

鐃緒申鐃緒申鐃緒申鐃緒申鐃宿わ申鐃緒申鐃緒申里鐃緒申箸鐃緒申鐃緒申鐃緒申鐃緒申老觜緒申里鐃緒申蕕�鐃獣て￥申鐃緒申??鐃初算鐃述にわ申鐃処う鐃竣「わ申鐃緒申鐃緒申鐃竣」などわ申鐃殉わ申鐃殉な居申鐃緒申鐃緒申鐃緒申鐃緒申Perl 5.9鐃緒申導鐃緒申鐃緒申鐃曙た鐃塾わ申//鐃初算鐃述￥申鐃緒申鐃緒申鐃夙わ申鐃緒申

sub foo{
  my ($required, $optional) = @_:
  $optional //= 42;
  # ...
}

鐃夙書けわ申茲�鐃祝なわ申泙鐃緒申鐃�

鐃緒申鐃緒申鐃緒申Hash鐃緒申箸鐃�

cover
Perl Cookbook (English)
 鐃緒申鐃旬醐申鐃緒申

鐃緒申鐃夙￥申鐃叔駈申鐃緒申鐃緒申鐃銃わ申鐃緒申鐃塾わ申鐃緒申鐃緒申鐃緒申鐃緒申Hash鐃緒申箸鐃緒申箸鐃緒申鐃緒申鐃祝￥申鐃�Cookbook鐃緒申pp.384鐃叔わ申匆陲気鐃銃まわ申鐃緒申

sub foo{
  my %arg = (
    optional => 42,
    @_, # 鐃緒申鐃緒申鐃緒申鐃楯ワ申鐃緒申鐃�
  );
}

鐃叔醐申鐃�@_鐃緒申鐃緒申鐃暑こ鐃夙で￥申同鐃緒申key鐃緒申鐃緒申鐃獣わ申鐃緒申鐃祝はわ申鐃曙が鐃緒申鐃緒申鐃叔常申颪�わ申鐃緒申鐃緒け鐃叔わ申鐃緒申Hash鐃祝わ申鐃暑こ鐃夙にわ申蝓�鐃緒申鐃緒申鐃緒申鐃緒申鐃銃縁申砲覆鐃淑ど￥申鐃緒申鐃緒申鐃緒申多鐃緒申鐃緒申鐃祝わ申鐃緒申鐃緒申有鐃緒申鐃緒申鐃緒申法鐃淑のでわ申鐃緒申鐃緒申Performance鐃祝はわ申鐃緒申鐃緒申鐃駿駈申鐃緒申鐃殉わ申鐃緒申鐃緒申鐃春に逸申鐃緒申鐃緒申鐃緒申鐃淑わ申鐃緒申里鐃緒申个鐃緒申討聾討喀个鐃緒申鐃緒申鐃�

foo('bar', 1);

鐃叔済わ申任鐃緒申鐃緒申鐃塾わ申鐃緒申

foo(required => 'bar', optional => 1);

鐃夙なってわ申鐃殉わ申鐃塾わ申鐃緒申鐃緒申任鐃緒申鐃�

Perl6鐃叔はどわ申鐃淑るか?

Perl6鐃叔は￥申鐃緒申鐃緒申鐃緒申鐃塾醐申鐃緒申鐃緒申鐃銃わ申鐃緒申鐃夙わ申鐃緒申鐃宿りし鐃緒申鐃緒申鐃緒申鐃祝なわ申泙鐃緒申鐃�

sub foo($required, $?optional = 42){
  # ....
}

鐃夙書くわ申鐃緒申鐃叔￥申鐃遵記鐃塾わ申鐃緒申鐃夙わ申鐃緒申鐃緒申鐃緒申鐃銃とっわ申鐃塾わ申同鐃緒申鐃祝なわ申泙鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃叔￥申

foo()                                   # compile-time error
foo('bar')                              # ok
foo('bar', 1);                          # ok
foo(required => 'bar', optional => 1);  # ok

鐃夙なるか鐃初う鐃曙し鐃緒申鐃叔はわ申鐃緒申泙鐃緒申鵑�￥申

Dan the Uninitialized Man