buffer that gets a method and callback and executes one method at time

buffer.coffee.js

window.Buffer =
  buffer: []
  executing: false
  pushToBuffer: (method, callback) ->
    Buffer.buffer.push ->
      Buffer.executing = true
      method (result) ->
        callback(result)
        Buffer.executeFromBuffer()
    Buffer.executeFromBuffer() unless Buffer.executing
  executeFromBuffer: ->
    if Buffer.buffer.length > 0
      executable = Buffer.buffer.shift()
      executable()
    else
      Buffer.executing = false

# Usage:
#
# sayHello = (callback) -> 
#   callback("Hello World")
#
# print = (result) ->
#   console.log result
#
# Buffer.pushToBuffer sayHello, print