If you don't need private variables, you could make it even simpler:
var person = {
first: '',
last: ''
}
var boy = Object.create(person);
var girl = Object.create(person);
In addition, now the variables "boy" and "girl" can also be
prototyped:
var otherBoy = Object.create(boy);
Object.create works on objects, so functions are no longer necessary
for prototypical inheritance in JavaScript. You'll still need
functions if you want private variables, however. Lastly, we can use
Object.create *right now* in all our code!
http://javascript.crockford.com/prototypal.html
It only supports the first parameter, though, not the second. So the
above example would work, but Daniel Friesen's won't (until browsers
get ES5 support).
On Aug 13, 8:29 pm, Samer Ziadeh <samerzia...@gmail.com> wrote:
> So how would this translate to the update method without the new keyword.
>
> function Person() {
> this.first = '';
> this.last = '';
>
> }
>
> var boy = new Person();
> var girl = new Person();
>
> On Thu, Aug 13, 2009 at 21:48, Daniel Friesen
> <nadir.seen.f...@gmail.com>wrote:
>
>
>
>
>
>
>
> > To create an object in ES3, yes. (ES3; ECMAScript 3; Current JavaScript)
> > ES5 adds a new method which follow the proper prototypal method (ES5;
> > ECMAScript 5; The next version, ES4 was discarded)
>
> > Object.create(proto, {...});
> > The first argument is a prototype to give it:
> > Object.create(Foo.prototype); is roughly the same as,
> > in mozilla js:
> > ({ __proto__: Foo.prototpe })
> > in normal js
> > function F() {}
> > F.prototype = Foo.prototype;
> > new F;
>
> > Just so you know the {...} is a object listing keys to add. Each key has
> > an object with data like value: (the value), or get: (a getter) and/or
> > set: (a setter), as well as the attributes enumerable (part of for-in
> > loops), writable (you can set it), and configurable (it can be removed
> > using `delete o.prop`)
>
> > There's a nice new idiom which involves using Object.create inside a
> > function, using that function's prototype as the proto, setting
> > properties, and returning that object. Essentially it does the same as
> > using `new Fn` except it gives you more control, and works whether you
> > use new or not.
>
> > There's also an interesting new strawman that was recently brought into
> > the harmony group, makes this possible:
> > function Foo() {
> > return {
> > [parent: Foo.prototype],
>
> > foo: "I'm a value",
> > const _bar: "You can't set or delete me after this",
> > };
> > }
>
> > ~Daniel Friesen (Dantman, Nadir-Seen-Fire) [http://daniel.friesen.name]
>
> > Samer Ziadeh wrote:
> > > Isn't the 'new' a needed keyword?
>
> > > On Thu, Aug 13, 2009 at 08:04, Andrea Giammarchi
> > > <andrea.giammar...@gmail.com <mailto:andrea.giammar...@gmail.com>>
> > wrote:
>
> > > Python rules, and I mainly agree, except the day "new" will not be
> > > necessary anymore we'll loose constructor duality, as functions,
> > > and implicit injected "init" methods.
>
> > > Regards
>
> > > On Tue, Aug 11, 2009 at 3:46 AM, Daniel Friesen
> > > <nadir.seen.f...@gmail.com <mailto:nadir.seen.f...@gmail.com>>
> > wrote:
>
> > > The requirement of "new" to create new js objects is an
> > > unnecessary
> > > piece of the language, in fact the need to use it disappears
> > > in ES5 as
> > > it's no longer the only way to create new objects with a set
> > > prototype.
> > > There's nothing strange about having a $ function and creating
> > > an object
> > > from it, in fact it's closer to real prototype-based
> > > programming than
> > > the `new Class` you see inside of JavaScript.
>
> > > ~Daniel Friesen (Dantman, Nadir-Seen-Fire)
> > > [http://daniel.friesen.name]
>
> > > --
> > > Samer Ziadeh
> > >www.samerziadeh.com<http://www.samerziadeh.com>
>
> > > "Let It Be"
>
> --
> Samer Ziadehwww.samerziadeh.com
>
> "Let It Be"
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