Course of Raku / Essentials

Typed variables

In Raku, a scalar variable (or, a scalar container) can keep a single object of different types. For example, the same variable can first contain a number, and then a string:

my $var = 42;
$var = 'Hello';

Here is another example of mixing different data types in the same expression:

my $a = '100';
my $b = 200;
say $a + $b; # 300

This is, probably, not the best coding practice, but it is a perfectly valid Raku program.

Nevertheless, Raku allows you to specify what a given variable may keep. There are more details in the below topics.

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