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3696479
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2010-09-12T20:27:16.133
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2010-09-12T20:32:24.523
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2010-09-12T20:32:24.523
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text
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Don't know if below is a neat use case or just a tip of the hat to Perl's linguistic lineage :) <pre><code># things todo (or should have done!) at this time of the day: given (TheTime->of_day) { when ('morning') { breakfast(); make_packed_lunch() if $_->is_work_day; } lunch() when 'afternoon'; when ('evening') { goto_pub() if $_->is_friday; dinner(); } default { say "Should be sleeping if its " . $_->{dt}->ymd } } </code></pre> And if you view <code>$_</code> has "it" then it works particular well (IMHO). The above works by <a href="http://perldoc.perl.org/overload.html" rel="nofollow noreferrer">overloading</a> the smart match operator which <code>given/when</code> rely on. Here is how <code>TheTime</code> class could be written to make my example work: <pre><code>{ package TheTime; use DateTime; use overload '~~' => '_check_hour', fallback => 1; our %day_time = ( morning => [0..11], afternoon => [12..17], evening => [18..23], ); sub of_day { my $class = shift; bless { dt => DateTime->now, }, $class; } sub is_work_day { shift->{dt}->day_of_week ~~ [1..5] } sub is_friday { shift->{dt}->day_of_week == 5 } sub _check_hour { my ($self, $greeting) = @_; $self->{dt}->hour ~~ $day_time{$greeting}; } } </code></pre> /I3az/ PS. Also see this blog post i did recently: <a href="http://transfixedbutnotdead.com/2010/08/30/givenwhen-the-perl-switch-statement/" rel="nofollow noreferrer">given/when – the Perl switch statement</a>
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1. POWhat kind of neat use cases exist for given/when?
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1. USdraegtun
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1. USdraegtun
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1. CO+1: nice use of `overload`
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