Simple prototypal inheritance in node.js

object_create.js

/* This shows how to use Object.create */

/** BASE MODEL **********************************/

function BaseModel(collection) {
    this.collection = collection;
}

BaseModel.prototype.getCollection = function() {
    return this.collection;
};

/** User Model ***********************************/

function UserModel() {
    // Call the super class' constructor, in the context of this UserModel instance,
    // passing in a parameter.
    BaseModel.call(this, 'users');
}

// Inherits the prototype methods from the base model.
UserModel.prototype = Object.create(BaseModel.prototype);
UserModel.prototype.constructor = UserModel;

UserModel.prototype.delete = function() {
    return 'delete a user in collection ' + this.getCollection();
};

/** Blog Model ***********************************/

function BlogModel() {
    BaseModel.call(this, 'blog');
}

// Inherits the prototype methods from the base model.
BlogModel.prototype = Object.create(BaseModel.prototype);
BlogModel.prototype.constructor = BlogModel;

BlogModel.prototype.getPosts = function() {
    return 'posts in collection ' + this.collection;
};

/*** Example *************************************/

var person = new UserModel();
console.log(person.delete()); // 'delete a user in collection users'

var blog = new BlogModel();
console.log(blog.getPosts()); // 'posts in collection blog'

util_inherits.js

/* This shows how to use util.inherits */

var util = require('util');

/** BASE MODEL **********************************/

function BaseModel(collection) {
    this.collection = collection;
}

BaseModel.prototype.getCollection = function() {
    return this.collection;
};

/** User Model ***********************************/

function UserModel() {
    // Call the super class' constructor, in the context of this UserModel instance,
    // passing in a parameter.
    BaseModel.call(this, 'users');
}

// Inherits the prototype methods from the base model.
util.inherits(UserModel, BaseModel);

UserModel.prototype.delete = function() {
    return 'delete a user in collection ' + this.getCollection();
};

/** Blog Model ***********************************/

function BlogModel() {
    BaseModel.call(this, 'blog');
}
util.inherits(BlogModel, BaseModel);

BlogModel.prototype.getPosts = function() {
    return 'posts in collection ' + this.collection;
};

/*** Example *************************************/

var person = new UserModel();
console.log(person.delete()); // 'delete a user in collection users'

var blog = new BlogModel();
console.log(blog.getPosts()); // 'posts in collection blog'

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