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sub display_hash { my (%hash) = @_; foreach (%hash) { print "$_ => $hash{$_}\n"; } }

In this case, we output the key/value pairs of the hash properly, displaying each pair on its own line As with arrays, care needs to be taken if you expect to pick out a single hash from a list of arguments The following will work because we extract the hash last:

but what we will say is that we re recommending that you write code that s very similar to code you might write if you were doing rapid prototyping or if you were in the early stages of an iterative development process We understand that our readers have a wide range of experience, so please don t be offended if you know everything in the following list

sub display_has_regexp { my ($regex, %hash) = @_; }

while this one won t because we try to extract the hash first (there will be an extra element, and Perl won t know how to assign this to the hash):

sub display_has_regexp { my (%hash, $regex) = @_;

.

6:

}

If you want to work with multiple hashes, then use references For example, the following subroutine returns the key intersection of two hashes:

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Your Goal Write down your goal for the prototype code you want to create As you develop and test the code, you might discover that you should have had a different intermediate goal That s great Go with the flow Focusing Find the sweet spot for your goals In general, you want your goals to be as focused as possible At the same time, you want your goal to test something interesting For instance, your goal might be Create a separate thread in an inner class It might turn out that once you ve done that you wonder whether you can create a thread in a constructor, or in an init block Cool! Try it In the list of coding projects that follows, we tried to create tasks that were in the sweet spot not too easy, but also not too broad Reference Materials Unlike prototyping on the job, try to start each project without using the API or any other reference material There s another kind of sweet spot here Ideally, you want to spend some time trying different approaches, but you don t want to get stuck either So, go easy on yourself if your first iteration of code doesn t work, but you have a couple of ideas, go ahead and try them, too As long as you re feeling positive and creative, keep experimenting When you think you ve hit a brick wall, don t punish yourself go ahead and look something up When you find you need to look something up, that s okay, but make a note of it Perhaps make a new flashcard about the thing you needed to look up The idea is to not get hung up trying to remember some little factoid Misunderstandings A couple of closely related meta-goals should be part of all the prototype code you create: you want to discover misunderstandings, and you want to discover lacks of understanding Sometimes, when you start prototyping, you ll discover that you mostly know what s going on, but that you got a few details wrong in other words, a misunderstanding Other times, you ll quickly discover that you ve got no idea how to proceed in other words, a lack of understanding As you might guess, our advice is to keep a log of these topics so you ll know which topics need the most attention Again, don t get hung up on any given topic.

sub intersection { my ($hasha, $hashb) = @_; my %newhash; foreach my $key (keys %{$hasha}) { $newhash{$key} = $$hasha{$key} if (exists $$hashb{$key}); } return %newhash; }

< php // call a function that returns a warning // suppress warning with @ echo @file_get_contents("non-existent-filetxt"); >

To use the subroutine:

%hasha = ('a' => 'b', 'b' => 'b', 'c' => 'b'); %hashb = ('b' => 'b', 'c' => 'b', 'd' => 'b'); %newhash = intersection(\%hasha, \%hashb);

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