Promise() vs. new Promise()

Claude Pache claude.pache at gmail.com
Wed Aug 20 08:18:49 PDT 2014


Le 20 août 2014 à 16:56, Alex Kocharin <alex at kocharin.ru> a écrit :

>  
> But... why?
>  
> I mean, every constructor can determine if it is called without `new` (that "this instanceof" check on top of every other constructor). So `new` keyword can really be removed from everywhere except in constructors themselves.
>  
> Using `new` does create issues. For example, you can't write "new require('something').Constructor(blah)", and I don't even remember how to put brackets right.
>  
> Why make people use it?

According to http://esdiscuss.org/notes/2013-07-25 (search for "anti-pattern"), allowing constructors without `new` would break subclassing.

—Claude



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