Ruby for Instance / Variadic Functions

# Define a variadic function that takes a variable number of arguments
# and returns their sum
def sum(*numbers)
  numbers.inject(0, :+)
end

# Define a variadic function that takes a variable number of arguments
# and returns the maximum value
def max(*numbers)
  numbers.max
end

# Define a variadic function that takes a variable number of arguments
# and returns an array of all the arguments
def to_array(*elements)
  elements
end