Develop a secure method for referencing objects within Underscore's framework

Question

Develop a secure method for referencing objects within Underscore's framework

While exploring the code in Underscore : http://underscorejs.org/docs/underscore.html

I stumbled upon

var _ = function(obj) {
  if (obj instanceof _) return obj;
  if (!(this instanceof _)) return new _(obj);
  this._wrapped = obj;
};

accompanied by this comment

Create a safe reference to the Underscore object for use below.

I am unsure of its purpose. Instead, why not simplify it to

(function() {
    var _ = {};

    _.VERSION = '1.7.0';
})();

What is the rationale behind the technique employed by the Underscore project?

javascript underscore.js

Answer 1

Answer №1

In order to create objects using the constructor pattern, one can use the _() function which is essentially the same as new _().

To add extra functionality to all instances spawned from _(obj) (or new _(obj)) with minimal memory footprint, you can extend the prototype of the constructor.

function Constructor(){}

Constructor.prototype.someMethod=function(){};

var instanceOne=new Constructor();
var instanceTwo=new Constructor();

This approach is similar to:

function factory(){
   var obj={};
   obj.someMethod=function(){}
   return obj;
}

var instanceOne=factory();
var instanceTwo=factory();

However, the latter method will consume more memory since it duplicates the function for each object rather than utilizing a shared prototype.

Answer 2

In order to create objects using the constructor pattern, one can use the _() function which is essentially the same as new _().

To add extra functionality to all instances spawned from _(obj) (or new _(obj)) with minimal memory footprint, you can extend the prototype of the constructor.

function Constructor(){}

Constructor.prototype.someMethod=function(){};

var instanceOne=new Constructor();
var instanceTwo=new Constructor();

This approach is similar to:

function factory(){
   var obj={};
   obj.someMethod=function(){}
   return obj;
}

var instanceOne=factory();
var instanceTwo=factory();

However, the latter method will consume more memory since it duplicates the function for each object rather than utilizing a shared prototype.

Develop a secure method for referencing objects within Underscore's framework

Answer №1

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