def print_single value
puts value
end

def print_with_default value = "Unknown"
puts value
end

def print_variables label = "Unknown", *variables
puts "#{label}: #{variables.join ', '}"
end

def print_nil
end

def multi_return
return "one", "two", "three"
end

def last_return
v = 3 * 10
"I am the return value"
end

# The following method accepts one parameter (required) and then prints it.
puts "01 Single Value\n\n"
print_single "Heya"

# The following method also accepts one parameter but it is optional.
# In this case, passing no parameter results in the default value being printed.
puts "\n02 Default Value\n\n"
print_with_default

# The following method prints a labeled, variable-length array. The label is optional
# and the array can be any length in size.
puts "\n03 Variable Length Parameters\n\n"
print_variables "My Color Picks", "red", "black", "green", "blue", "violet"

# The following method does absolutely nothing but all Ruby methods return a value and, in this case,
# we get nil as the return value.
puts "\n04 Nil Return Value\n\n"
puts print_nil

# One handy feature is the ability to return multiple values. The following method demonstrates
# having multiple values returned. If you still have the "06-variables.rb" script handy, you might
# play with this more to see how you could assign these values to multiple variables. Don't be shy, give it a try!
puts "\n05 Multi-Return Value\n\n"
puts multi_return

Heya

02 Default Value

Unknown

03 Variable Length Parameters

My Color Picks: red, black, green, blue, violet

04 Nil Return Value

nil

05 Multi-Return Value

one
two
three

06 Last Return