maybe.coffee

# Maybe in Coffeescript
# Terminology from Haskell; API from Scala
# Inspired by https://gist.github.com/andyhd/1618403

just = (value) ->
  # Applying the monad will act as "map" by default
  # To make people even lazier, 'this' is bound to the value anyway.
  monad = (f) -> just f.call(value, value)
  monad.getOrElse = -> value
  monad.getOr = -> value
  monad.isEmpty = -> false

  monad

nothing = (->
  monad = (f) -> nothing
  monad.getOrElse = (f) -> f()
  monad.getOr = (other) -> other
  monad.isEmpty = -> true

  monad
)()

# The helper function/module object.
maybe = (value) ->
  if value?
    just value
  else
    nothing

maybe.just = just
maybe.nothing = nothing

module.exports = maybe