Small Proposal "!in"

[Mike Samuel]

On Thu, Jul 19, 2018 at 9:26 AM Michael Theriot <
michael.lee.theriot at gmail.com> wrote:

> > 'string' === typeof document.createElement('input').type
> > // true
>
> It should be noted this is a "loose check"; it does not determine whether
> or not the property exists when its value equals undefined. It also
> triggers getters, whereas `in` reports whether or not the property exists
> without triggering a getter.
>

Good point.   `in` does trigger "has" proxy handlers though, so neither is
side-effect free.



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