Function modifyMutRef

modifyMutRef<S, A>(ref): ((modifier) => Mut<S, never[]>)
Modifies a value of the reference in a scope of Mut environment.
Type Parameters
- S
- A
Parameters
- ref: MutRef<S, A>
  A target to modify.
Returns ((modifier) => Mut<S, never[]>)
The modifying operation.
- - (modifier): Mut<S, never[]>
  - Parameters
    - modifier: ((oldValue) => A)
      (oldValue): A
      Parameters
      oldValue: A
      Returns A
    Returns Mut<S, never[]>
- Defined in src/mut.ts:222

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