call expression [expression ...]

Call a subroutine whose name is computed by evaluating the first argument expression. All other expressions are evaluated too and the results are passed to the subroutine as arguments.

This command should only be used if the name of the subroutine isn't known at the compile time. Otherwise it is recommended to use a direct subroutine call of the form:

subroutine-name [argument1 argument2 ...]

def a $arg { echo "A says" $arg }
def b $arg { echo "B says" $arg }
a "hallo!";  # call subroutine a
b "hallo!";  # call subroutine b
call { chr(ord("a")+rand(2)) } "surprise!"; # call a or b randomly 

def, return