Perl 6 allows using typed variables. To tell the compiler that the variable is typed, you simply need to name the type while declaring the variable.
Some of the types available in Perl 6 are obvious and do not need comments:
Bool, Int, Str Array, Hash, Complex
Some might require a small comment:
Num, Pair, Rat
The Num type is used to handle floating-point variables, and a Pair is a “key; value” pair. The Rat type introduces rational numbers with numerators and denominators.