Feat: add ImmutableMap.sortedCopyOf - #8591
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Returns an immutable map that iterates in sorted key order while still using hashing for lookups, as an alternative to ImmutableSortedMap's O(log N) lookups. The sort is stable, and duplicate keys are resolved in favor of the last value, matching buildKeepingLast(). RELNOTES=`collect`: Added `ImmutableMap.sortedCopyOf`, which returns an immutable map that is sorted by key.
Covers natural and comparator ordering, stability, null handling, and duplicate-key behavior (last value wins). RELNOTES=n/a
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DerrickUnleashed
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August 4, 2026 11:18
chytanvir1998-png
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Aug 8, 2026
cpovirk
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type=enhancement
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Fixes #8552.
Adds two overloads, matching the existing ImmutableList.sortedCopyOf pattern:
sortedCopyOf(Map)- sorts by natural key ordersortedCopyOf(Comparator, Map)- sorts by a given key comparatorThe result is a regular ImmutableMap (hashing-based lookups), just with entries iterating in sorted order - handy when you want deterministic iteration without the
O(log N)lookups of ImmutableSortedMap.Behaviour notes:
Builder.buildKeepingLast().Also includes a GWT super-source implementation and tests.