The scope of dynamic variables is calculated at the moment when a variable is accessed. Thus, two or more calls of the same code may produce different results.
Dynamic variables are marked with the * twigil (a character clearly referencing a wildcard).
In the following example, the echo() function prints a dynamic variable $*var, which is not declared in the function, nor is it a global variable. It, nevertheless, can be resolved when used in other functions, even if they have their own instances of the variable with the same name.
sub alpha {
my $*var = 'Alpha';
echo();
}
sub beta {
my $*var = 'Beta';
echo();
}
sub echo() {
say $*var;
}
alpha(); # Alpha
beta(); # Beta