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# function that takes no arguments
function always_return_5 ()
    return 5
end always_return_5

five = always_return_5()  # 5


# function that takes an argument and does no type-checking
function add_10_untyped (a)
    return a+10
end add_10_untyped

b = add_10_untyped(4) # 14


# function that takes two arguments
function add_two_untyped (a, b)
    return a+b
end add_two_untyped

b = add_two_untyped(9, 11) # 20


# function that takes an argument that must be a number
function add_10_to_number (a:number)
    return a+10
end add_10_to_number

b = add_10_to_number(6) # 16
b = add_10_to_number('Hello')  # Run-time error


# function that returns a list of four values
function return_4_values_as_list(a)
    return [a+4, a+3, a+2, a+1]
end return_4_values

b = return_4_values_as_list(10) # [14,13,12,11]


# return four values as named elements of a structure
function return_4_values_as_definition(a)
    return (w: a+1, x: a+2, y:a+3, z:a+20)
end return_4_values_as_definition

b = return_4_values_as_definition(10) # (w:11,x:12,y:13,z:30)


# function that takes any number of arguments
function print_all_params
    loop arg in arguments()
        print(arg)
    end loop
end print_all_params

print_all_params(5, 6, 7, 'Hello')