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Add the upsert function for compatibility with containers, which added upsert in PR #1145. The function updates the value at a key or inserts a value if the key is not in the map: upsert :: Hashable k => (Maybe v -> v) -> k -> HashMap k v -> HashMap k v This fills a gap in the family of map-modifying functions: - adjust: (a -> a) - updates existing value only - update: (a -> Maybe a) - update or delete - upsert: (Maybe a -> a) - insert or update (always returns a value) - alter: (Maybe a -> Maybe a) - insert, update, or delete Closes #549. Assisted-by: GLM-5 via Fireworks AI <noreply@fireworks.ai>
The upsert and fromListUpsert functions are not yet in a released containers version. Fetch containers from git to enable model-based testing. Assisted-by: GLM-5 via Fireworks AI <noreply@fireworks.ai>
Add fromListUpsert for compatibility with containers, which added it in PR #1190: fromListUpsert :: Hashable k => (a -> Maybe v -> v) -> [(k, a)] -> HashMap k v This builds a map from a list, using the provided function to combine values. Equivalent to performing an upsert for each key/value pair. Assisted-by: GLM-5 via Fireworks AI <noreply@fireworks.ai>
Checking for pointer equality seems futile too
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Closes #549.