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 <[email protected]>
wrote:
> On 4/10/15, Axel Rauschmayer <[email protected]> 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
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