foo();                       # without arguments
foo(1, 2);                   # with two arguments
foo(args...);                # with a variable number of arguments
foo(name: 'Bar', age: 42);   # with named arguments

var f = foo;                 # store the function foo inside 'f'
var result = f();            # obtain the return value of a function

var arr = [1,2,3];
foo(arr);                    # the arguments are passed by object-reference