Whilst on the topic of object literal extensions, did we make any progress
on supporting what allen calls
exemplars<https://mail.mozilla.org/pipermail/es-discuss/2011-October/017369.html>
?
let Employee = Person <| {
constructor(name, title) {
super(name);
this.title = title;
},
describe() {
return super.describe(this) + " (" + this.title + ")";
}
};
On Sat, Oct 29, 2011 at 4:23 AM, Axel Rauschmayer <a...@rauschma.de> wrote:
> http://brendaneich.com/2011/10/jsconf-eu/
>
> I’d be sad not to have class literals in JavaScript. However, with the new
> object literal extensions, things are still much better than in ES5.
> Compare: The ES5 version is clumsy.
>
> // Super
> function Person(name) {
> this.name = name;
> }
> Person.prototype.describe = function() {
> return "Person called "+this.name;
> };
>
> // Sub
> function Employee(name, title) {
> Person.call(this, name);
> this.title = title;
> }
> Employee.prototype = Object.create(Person.prototype);
> Employee.prototype.constructor = Employee;
> Employee.prototype.describe = function() {
> return Person.prototype.describe.call(this)+" ("+this.title+")";
> };
>
> The ES.next version is quite nice:
>
> // Super
> function Person(name) {
> this.name = name;
> }
> Person.prototype .= {
> describe() {
> return "Person called "+this.name;
> }
> }
>
> // Sub
> Person <| function Employee(name, title) {
> super(name);
> this.title = title;
> }
> Employee.prototype .= {
> describe() {
> return super.describe(this)+" ("+this.title+")";
> }
> };
>
> This is not bad at all, quite teachable! Having a single construct instead
> of piecing things together via multiple assignments might be a problem in
> some cases. Then you could use the latest incarnation of Allen’s class
> pattern:
>
> Person <| function Employee(name, title) {
> super(name);
> this.title = title;
> }.={
> prototype.={
> describe() {
> return super.describe(this)+" ("+this.title+")";
> }
> }
> // “class” variables go here
> }
>
> [I’m using the destructive version of the extension operator, as shown in
> Brendan’s blog post]
>
> --
> Dr. Axel Rauschmayer
> a...@rauschma.de
>
> home: rauschma.de
> twitter: twitter.com/rauschma
> blog: 2ality.com
>
>
>
> _______________________________________________
> es-discuss mailing list
> es-discuss@mozilla.org
> https://mail.mozilla.org/listinfo/es-discuss
>
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