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.
This section contains 4 exercises. Examine all the topics of this section before going to the coding practice.