function_definition.coffee

square = (x = 0) ->
  x * x
sum = (x = 0, y = 0) ->
  x + y
console.log(square(2))
console.log(square())
console.log(sum(10, 5))
console.log(sum(3, 7))

name = 'John'
lastName = 'Smith'
makeUser = ({ name, lastName })->
  user = { name, lastName }
console.log(makeUser({ name, lastName }))

adding = (numbers...)->
  sum = 0
  for number in numbers
    sum += number
  sum

console.log(adding(1,2,3,4,5))
console.log(adding(14,16,9))