Function mapMutRef

mapMutRef<A, B>(fn): (<S>(ref) => Mut<S, B>)
Reads a value from the reference and converts by fn. It throws on the referent value was not initialized or dropped.
Type Parameters
- A
- B
Parameters
- fn: ((a) => B)
  A mapping function.
  - - (a): B
    - Parameters
      a: A
      Returns B
Returns (<S>(ref) => Mut<S, B>)
The reading and mapping operation which results B.
- - <S>(ref): Mut<S, B>
  - Type Parameters
    - S
    Parameters
    - ref: MutRef<S, A>
    Returns Mut<S, B>
- Defined in src/mut.ts:235

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