How to create a simple --JavaScript-- CoffeeScript library in jQuery style. Based on http://bjarneo.codes/how-to-create-a-simple-javascript-library-like-jquery/

gistfile1.coffee

# Anonymous function
do ->
  # Q returns new Library object that hold our selector. Ex: Q('.wrapper')
  Q = (params) ->
    new Library(params)

  # In our Library we get our selector with querySelectorAll (we do not support < ie8)
  # We also add selector length, version and twitter/github or whatever you like as information about your library.
  Library = (params) ->
    # Get params
    selector = document.querySelectorAll(params)
    i = 0

    # Get selector length
    @length = selector.length
    @version = '0.1.0'
    @twitter = 'http://www.twitter.com/bjarneo_'

    # Add selector to object for method chaining
    while i < @length
      @[i] = selector[i]
      i++

    # Return as object
    this

  # Extend the Library object.
  Q.fn = Library:: =
    # Hide element(s) from DOM
    # @returns {*}
    hide: ->
      len = @length

      # Here we simply loop through our object (this) and set the css to display none.
      #If you got more that 1 node from DOM selected with querySelectorAll, you would hide them all.
      while len--
        @[len].style.display = 'none'

      # It's important to return this if you want to chain methods!
      this

    # Show element(s) from DOM
    # @returns {*}
    show: ->
      len = @length
      while len--
        @[len].style.display = 'block'
      this

  # Assign our Q object to global window object.
  window.Q = Q unless window.Q
  return

# Example usage:
Q '.wrapper'