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Add java.util.WeakHashMap #5

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jdegoes opened this issue Dec 5, 2018 · 4 comments
Open

Add java.util.WeakHashMap #5

jdegoes opened this issue Dec 5, 2018 · 4 comments

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@jdegoes
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jdegoes commented Dec 5, 2018

Could be based on WeakMap, supported since ECMAScript 6 (2015) and on all major browsers.
@sjrd
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sjrd commented Dec 5, 2018

Unfortunately not. JavaScript's WeakMap lacks several fundamental features compared to Java's. In particular, it does not provide iteration of keys/entries (on purpose).

To implement java.util.WeakHashMap, we will need something more, which might be coming with a proposal for WeakRefs: https://github.com/tc39/proposal-weakrefs

spalberg referenced this issue in FelixGail/REScala Aug 22, 2020
@spalberg
Removed WeakHashMap (https://github.com/scala-js/scala-js/issues/3503)
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rmgk referenced this issue in rescala-lang/REScala Aug 27, 2020
@spalberg @rmgk
Removed WeakHashMap (https://github.com/scala-js/scala-js/issues/3503)
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@tarsa
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tarsa commented Sep 10, 2020

Seems that WeakRefs are now present in majority (by market share) of browsers: https://www.caniuse.com/?search=weakref https://github.com/tc39/proposal-weakrefs/pull/212/files

@sjrd
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sjrd commented Dec 16, 2020

WeakRefs are now at Stage 4, so we could now implement this. PR welcome.

@sjrd sjrd transferred this issue from scala-js/scala-js Jul 9, 2021
@sjrd
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sjrd commented Jul 9, 2021

j.u.WeakHashMap can now be implemented in this repo, on top of WeakReference and ReferenceQueue.

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@jdegoes @sjrd @tarsa