Many people use *"this"*, *"prototype"* and *"new"*, like:
> *module.exports = function Car (name, cost, mpg, alternative) {*
> * this.name <http://this.name> = name;*
> * this.cost = cost;*
> * this.env_damage = mpg;*
> * this.alternative = alternative;*
> *};*
> *Car.prototype.appeal = function() {*
> * return(this.cost/this.mpg);*
> *};*
> *Car.prototype.snark = function() {*
> * return(this.alternative.advise());**};*
I think that is very "beginner unfriendly" and a lot of people i know got
very confused by
*"prototypes"* and the different way* "this"* can be set and how it can
trip you over.
And i remember a time when i wanted to transform an instance after
creation, but
had no influence over all the many places which used "new Name(...)", so i
kinf of
dislike the use of *"new"* too.
I wonder if it would be bad to get rid of those and instead write the car
module like:
> *module.exports = function Car (name, cost, mpg, alternative) {*
> * var api = {*
> * name: name,*
> * cost: cost,*
> * env_damage: mpg,*
> * alternative: alternative,*
> * appeal: function appeal () { api.cost / api.mpg; },*
> * snark: function snark () { api.alternative.advise(); }*
> * };*
> * return api;**};*
2015-01-10 17:12 GMT+01:00 // ravi <[email protected]>:
> On Jan 10, 2015, at 5:04 AM, Prabhash Rathore <[email protected]>
> wrote:
> >
> > Based on your replies, I think this is the best way to represent a data
> object as it's just data and object can represent this data:
> > module.exports = {
> >
> > name
> > : '';
> >
> > department
> > : '';
> > }
> > However I have noticed people using function() to create data objects
> and then they just return an object inside the function (see below
> example)? Is there any specific use case or reason on using function
> instead of using just object literal?
>
>
>
> It depends on what it is you want your module to offer. Say the module
> provides a bunch of utility functions. Then you may just choose to export
> each function and be done:
>
> str_utils.js:
>
> exports.uncamelcase = function(str) { …. };
> exports.is_palindrome = function(str) { …. };
> exports.is_numeric = function(str) { …. };
>
> Then someone can use it thus:
>
> var str_utils = require(‘str_utils’);
>
> if( str_utils.is_palindrome(person_name) === true )
> console.log(“Well, aren’t you special!”);
>
> On the other hand, if your module returns a constructor/class to be used
> for instantiating new objects, then you may wish to do this:
>
> module.exports = Car;
>
> function Car(name, cost, mpg, alternative)
> {
> this.name = name;
> this.cost = cost;
> this.env_damage = mpg;
> this.alternative = alternative;
> }
>
> Car.prototype.appeal =
> function()
> {
> return(this.cost/this.mpg);
> };
>
> Car.prototype.snark =
> function()
> {
> return(this.alternative.advise());
> };
>
> Then someone could:
>
> var Car = require(‘car’);
> var metro = require(‘metro’);
>
> var new_car = new Car(‘Hummer’, 80000, 2, metro);
>
> if( new_car.appeal() > 700 )
> console.log(“Congratulations on your fancy”, new_car.name, “but”,
> new_car.snark());
>
> Etc. Keep in mind the part played by require/module caching (if you return
> an object, it will be cached and returned from the cache at the next
> require — this may or may not be what you want: I use it as a way to load
> dependencies without passing them around).
>
> —ravi
>
>
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