immutable-sorted
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Feature request: get-and-delete operation for SortedMap
I just today realized that Immutable.js doesn't provide an operation for this, though I really only need it for SortedMap
. I would like a method on SortedMap
that removes and returns the value under the given key as well as the updated map. In Flow the function prototype is straightforward:
getAndDelete(key: K): [?V, SortedMap<K, V>] {}
let [val, map] = map.getAndDelete('key');
Apparently in Immutable.js this can be done by returning null
from the closure passed to Collection.update()
(though this is undocumented) but SortedMap
doesn't appear to support this; it just updates the value as null
. I know this can be done with get()
then delete()
but I'd like to avoid the redundant lookup if possible.