Prev: kv

Looping over keys of a hash

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

The same way we can loop over keys of a hash - after fetching them using the "keys" function.

The declaration of hashes in Perl 6 is similar to that in Perl 5 but when access individual elements in the hash it now keeps the % prefix. Thus the value of the key "Foo" will be %phone{"Foo"}. Similarly if $name contains "Foo" we can use the %phone{$name} expression to get back the relevant value.

As mentioned earlier the string interpolation of hashes requires curly braces around the statement.


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

my %phone = 
    "Foo" => 123,
    "Bar" => 456,

for keys %phone -> $name {
    say "$name %phone{$name}";



Bar 456
Foo 123

The Perl 6 Tricks and Treats newsletter has been around for a while. If you are interested to get special notification when there is new content on this site, it is the best way to keep track:
Full name:
This is a newsletter temporarily running on my personal site ( using Mailman, till I implement an alternative system in Perl 6.
Gabor Szabo
Written by Gabor Szabo

Published on 2012-01-01

Prev: kv


In the comments, please wrap your code snippets within <pre> </pre> tags and use spaces for indentation.
comments powered by Disqus
Suggest a change
Elapsed time: 2.3359478

Perl 6 Tricks and Treats newsletter

Register to the free newsletter now, and get updates and news.