mutative
unadlib
Efficient immutable updates, about 3-6x faster than Immer.
- Mutation makes immutable updates - Immutable updates of objects, arrays, Maps and Sets, written as mutations of a draft.
- High performance - About 6.6x faster than Immer with each library's defaults, and faster than hand-written spreads in measured wide-object and large-array insertion workloads.






