proto-scope v0.0.5

proto-scope

Writes objects without class, but in the prototype way.

Usage

npm install --save proto-scope

Here is a demo of using it:

proto = require 'proto-scope'

• Inherent

Passing object to proto.as to create sub-class, passing object to proto.new to create instance:

human = proto.as
  init: -> @name = 'human race'
  give_name: (@name) ->
  introduce: -> console.log "this is #{@name}"

tom = human.new()
tom.introduce() # => "this is human race"

man = human.as
  speak: ->
    print 'speaks by', @name
dan = man.new()
dan.give_name 'Dan'
dan.introduce() # => "this is Dan"
dan.speak() # => "speaks by Dan"

• Super

a = proto.as
  init: ->
    console.log 'this is a'
b = a.as
  init: ->
    console.log 'this is b'
    @super()
c = b.new
  init: ->
    console.log 'this is c'
    @super()

Implementation

the difference between new and as is: new contains @init?():

module.exports =
  as: (object) ->
    o = object or {}
    o.__proto__ = @
    o
  new: (object) ->
    o = @as object
    o.init?()
    o

Also, we my need super, so dirty code comes:

module.exports =
  as: (object) ->
    o = object or {}
    o.__called__ = undefined
    o.__proto__ = @
    for key, value of o
      f = (key, value) ->
        if typeof value is 'function'
          if key in ['as', 'new', 'super']
            return
          o[key] = (args...) ->
            o.__called__ = key
            value.apply o, args
          o[key].toString = ->
            value.toString()
      f key, value
    o
  super: ->
    @__proto__[@__called__]?()

Read this for more details: http://javascript.info/tutorial/inheritance Also available for JavaScript if you like that kind of life style...

Limitations

This can not be widely used, since __proto__ is not supported in some platforms.

Actually there are some problems implementing OOP with prototype, and more people choose using class, but prototype is a simple concept.

Learn from Lua

This is kind of syntax from Lua: http://www.lua.org/pil/16.1.html

function Account:new (o)
    o = o or {}   -- create object if user does not provide one
    setmetatable(o, self)
    self.__index = self
    return o
  end

License

MIT