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What Mutation Functions Are
- Mutation functions take current state and an operation, returning a new modified copy without mutating the original.
- They enable modeling state changes immutably, fitting well with functional programming and event sourcing.
Refactor Mutation Function Arguments
- Refactor mutation functions to take an operation or event as a single argument for universality.
- This simplifies handling of different state changes within one function.
Use Mutation Functions with Reduce
- Use the mutation function as a reducing function over a sequence of operations to apply multiple state changes.
- This technique efficiently computes the final state from a history of operations.