d at domenic.me (2015-04-19T23:38:09.021Z)
Babel is a terrible reference implementation for subclassing since it relies on the engine. See the docs http://babeljs.io/docs/usage/caveats/#classes and https://github.com/babel/babel/issues/1172 for more info. This exact question (super in derived class constructors) was also indirectly bought up recently in this issue: https://github.com/babel/babel/issues/1131
Babel is a terrible reference implementation for subclassing since it relies on the engine. See the docs http://babeljs.io/docs/usage/caveats/#classes and https://github.com/babel/babel/issues/1172 for more info. This exact question (super in derived class constructors) was also indirectly bought up recently in this issue: https://github.com/babel/babel/issues/1131 On Fri, Apr 10, 2015 at 6:57 PM, Garrett Smith <dhtmlkitchen at gmail.com> wrote: > On 4/10/15, Axel Rauschmayer <axel at rauschma.de> wrote: >> The reason why you need to call the super-constructor from a derived class >> constructor is due to where ES6 allocates instances - they are allocated >> by/in the base class (this is necessary so that constructors can be >> subclassed that have exotic instances, e.g. `Array`): >> > Can you please explain how extending Array works. Also what is the > optional identifier optional for in ClassExpression: > var myArray = (new class B extends Array { > constructor() { > super(1,2,3,4,5); > } > }); > alert(myArray.length); // it's 0 in Babel. > -- > Garrett > @xkit > ChordCycles.com > garretts.github.io > personx.tumblr.com > _______________________________________________ > es-discuss mailing list > es-discuss at mozilla.org > https://mail.mozilla.org/listinfo/es-discuss -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20150410/09780dc2/attachment.html>