prototype-less

The whole package was inspired by a post by Reginald “Raganwald” Braithwaite: Mixins, Forwarding, and Delegation in JavaScript

Provides helper functions to structure software using prototype-less techniques: mixin, forwarding and delegation.

The general idea is to separate the model domain from the implementation domain: separate properties (data) from behaviours (methods).

Installation

Node Dependency

Execute following line

npm install prototype-less@0.0.x --save

Require module

var pless = require('prototype-less');

Methods

Method Matrix (used context to resolving time)

Used Context	Early Bound	Late Bound	Later Bound (State Machines)
BaseObject	mixin	delegate	dynamicDelegate
MetaObject	privateMixin	forward	dynamicForward

mixin

Parameters:

• baseObject: some Object to be extended.
• metaObject: the template to be applied to the baseObject.

Our person object is a template (metaobject), it provides some functionality to be mixed into an object.

// extends a domain with behaviours,
// but behaviours access and modifies baseobject's properties
pless.mixin(raganwald, person);

privateMixin

Parameters:

• baseObject: some Object to be extended.
• metaObject: the template to be applied to the baseObject.

Same as mixin but the properties related to the injected behavior are kept private.

var hasCareer = {
  career: function () {
    return this.chosenCareer;
  },
  setCareer: function (career) {
    this.chosenCareer = career;
    return this;
  },
  chosenCareer: 'unemployed' // initial value
};

// extends a domain with behaviours,
// but keeps behaviour specific properties private
// example here: this.chosenCareer
// the property won't be attached to Object "raganwald"
pless.privateMixin(raganwald, hasCareer);

forward

Parameters:

• baseObject: object issuing the call.
• metaObject: object providing behaviour and context.

Creates a relationship between Objects. Here the function is provided by the metaobject and it is executed using the metaobject's context.

delegate

Parameters:

• baseObject: object issuing the call and providing context.
• metaObject: object providing behaviour.

Creates a relationship between Objects. Here the function is provided by the metaobject and it is executed using the baseobject's context.

dynamicForward

Parameters:

• baseObject: object issuing the call.
• metaObject: object providing behaviour and context.
• propertyName: baseObject property to which the metaobject will be bound.

Same as forward but the target of the forwarding (metaobject) is late bound: it is solved at run-time and opens applications for modeling classes of behaviour that change dynamically (as state machines).

dynamicDelegate

Parameters:

• baseObject: object issuing the call and providing context.
• metaObject: object providing behaviour.
• propertyName: baseObject property to which the metaobject will be bound.

Same as delegate but the target of the delegation (metaobject) is late bound: it is solved at run-time and opens applications for modeling classes of behaviour that change dynamically (as state machines).

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Copyright (c) 2015 Luscus ([e-mail])

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