Function map

map<L, R, B>(f: ((a: R) => B), either: Either<L, R>): Either<L, B>
Maps the right value if present with the mapping function.

Example
```
map(right(1), num => num + 1) === right(2)
map(left("error"), num => num + 1) === left("error")
```
Type Parameters
- L
- R
- B
Parameters
- f: ((a: R) => B)
  - - (a: R): B
    - Parameters
      
      a: R
      
      Returns B
- either: Either<L, R>
Returns Either<L, B>
- Defined in packages/utility/src/either/index.ts:76

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