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# bkhl's solution

## to Word Count in the Perl 5 Track

Published at Sep 20 2019 · 0 comments
Instructions
Test suite
Solution

Given a phrase, count the occurrences of each word in that phrase.

For example for the input `"olly olly in come free"`

``````olly: 2
in: 1
come: 1
free: 1
``````

## Source

This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour.

## Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

### word_count.t

``````#!/usr/bin/env perl
use strict;
use warnings;
use open ':std', ':encoding(utf8)';
use utf8;

use Test2::Bundle::More;
use FindBin qw(\$Bin);
use lib \$Bin, "\$Bin/local/lib/perl5";

my \$module = 'Phrase';

my @cases = (

# input                                       expected output                  title
[ 'word', { word => 1 }, 'one word' ],
[ 'one of each', { one => 1, of => 1, each => 1 }, 'one of each' ],
[ 'one fish two fish red fish blue fish',
{ one => 1, fish => 4, two => 1, red => 1, blue => 1 },
'multiple occurences'
],
[ 'car : carpet as java : javascript!!&@\$%^&',
{ car => 1, carpet => 1, as => 1, java => 1, javascript => 1 },
'ignore punctuation'
],
[ 'testing, 1, 2 testing',
{ testing => 2, 1 => 1, 2 => 1 },
'include numbers'
],
[ 'go Go GO', { go => 3 }, 'normalize case' ],
);

plan 3 + @cases;

ok -e "\$Bin/\$module.pm", "missing \$module.pm"
or BAIL_OUT(
"You need to create a module called \$module.pm with a function called word_count() that gets one parameter: the text in which to count the words."
);

eval "use \$module";
ok !\$@, "Cannot load \$module.pm"
or BAIL_OUT("Does \$module.pm compile?  Does it end with 1; ?");

can_ok( \$module, 'word_count' )
or BAIL_OUT("Missing package Phrase; or missing sub word_count()");

my \$sub = \$module . '::word_count';

foreach my \$c (@cases) {
no strict 'refs';
is_deeply \$sub->( \$c->[0] ), \$c->[1], \$c->[2];
}``````
``````package Phrase;

use strict;
use warnings FATAL => 'all';

use Exporter qw(import);
our @EXPORT_OK = qw(word_count);

sub word_count() {
my (\$phrase) = @_;

my %result;

\$result{lc \$_}++ foreach (\$phrase =~ /(\w+)/g);

return \%result;
}

1;``````