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Hello World - scalar variables

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.

Strings can be stored in so called scalar variables. Each such variable starts with a $ sign and then alphanumeric characters, underscore or dash. Before using such a variable the first time one has to declare it by the my keyword.

my $this_is_a_variable;
my $ThisIsAnotherVariableButWeDontLikeItSoMuch;
my $this-is-a-variable;

Variables are case sensitive.

my $h;
my $H;

tutorial/scalars/hello_world_variable.p6

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

my $greeting = "Hello World";
say $greeting;

my $Gábor-was-born-in = 'Hungary';
say $Gábor-was-born-in;

By default scalar variables have no specific types but later we will see how can we restrict the values a scalar can hold to a number or to any other type.

One can also declare a variable without giving it an inital value:

my $x;

In such case the value of the variable will be Any() which is just case of being not defined.


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Gabor Szabo
Written by Gabor Szabo

Published on 2012-01-01


Prev: First steps in Perl 6

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