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Overview of hashes

Note! This site is about Perl 6.
If you are looking for a solution for the current production version of Perl 5, please check out the Perl 5 tutorial.

tutorial/hash/hash.p6

#!/usr/bin/env perl6
use v6;

# creating hashes
my %h1 = first => '1st', second => '2nd';

if %h1{'first'}.defined {
    say "the value of 'first' is defined";
}
if %h1<second>.defined {
    say "the value of 'second' is defined";
}

if %h1.exists('first') {
    say "the key 'first' exists in h2";
}

say %h1.exists('third') ?? "third exists" !! "third does not exist";

say %h1<first>;
say %h1<second>;

# TODO hash with fixed keys not implemented yet
#my %h2{'a', 'b'} = ('A', 'B');
#say %h2.delete('a');
#say %h2.delete('a');

Output

tutorial/hash/hash.p6.out

the value of 'first' is defined
the value of 'second' is defined
the key 'first' exists in h2
third does not exist
1st
2nd


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Gabor Szabo
Written by Gabor Szabo

Published on 2012-01-01


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