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Re: Required guidance to simplify this program

by vinoth.ree (Prior)
on Jun 04, 2013 at 05:52 UTC ( #1036899=note: print w/ replies, xml ) Need Help??


in reply to Required guidance to simplify this program

Use grep and hash method to count the number of occurrence of elements in array as below.

use strict; use warnings; use Data::Dumper; my %count; my @array = qw(John Sue Larry Mary John Mary Larry John Joe Lisa John +Mary); grep {++$count{$_}} @array; print Dumper \%count;

All is well


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Re^2: Required guidance to simplify this program
by Anonymous Monk on Jun 04, 2013 at 06:12 UTC

    Be that as it may, function map can also be used, but their usage i.e map and grep , like this is NOT efficient, because you are throwing away their return values.

Re^2: Required guidance to simplify this program
by tobyink (Abbot) on Jun 04, 2013 at 06:35 UTC

    Using grep and map in a void context is generally discouraged. A for statement modifier is usually clearer, and almost always faster.

    use strict; use warnings; use Data::Dumper; my @array = qw(John Sue Larry Mary John Mary Larry John Joe Lisa John +Mary); my %count; $count{$_}++ for @array; print Dumper \%count;
    package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

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