Function mapOrElse

mapOrElse<T, U>(orElseFn, mapFn, maybe): U
Map over a Maybe instance and get out the value if maybe is a Just, or use a function to construct a default value if maybe is Nothing.

Examples
```
const length = (s: string) => s.length;
const getDefault = () => 0;

const justAString = Maybe.just('string');
const theStringLength = mapOrElse(getDefault, length, justAString);
console.log(theStringLength); // 6

const notAString = Maybe.nothing<string>();
const notAStringLength = mapOrElse(getDefault, length, notAString)
console.log(notAStringLength); // 0
```
Type Parameters
- T
  The type of the wrapped value.
- U
  The type of the wrapped value of the returned Maybe.
Parameters
- orElseFn: (() => U)
  The function to apply if maybe is Nothing.
  - - (): U
    - Returns U
- mapFn: ((t: T) => U)
  The function to apply to the wrapped value if maybe is Just
  - - (t): U
    - Parameters
      t: T
      Returns U
- maybe: Maybe<T>
  The Maybe instance to map over.
Returns U
- Defined in maybe.ts:587
mapOrElse<T, U>(orElseFn, mapFn): ((maybe: Maybe<T>) => U)
Type Parameters
- T
- U
Parameters
- orElseFn: (() => U)
  - - (): U
    - Returns U
- mapFn: ((t: T) => U)
  - - (t): U
    - Parameters
      t: T
      Returns U
Returns ((maybe: Maybe<T>) => U)
- - (maybe): U
  - Parameters
    - maybe: Maybe<T>
    Returns U
- Defined in maybe.ts:588
mapOrElse<T, U>(orElseFn): ((mapFn: ((t: T) => U)) => ((maybe: Maybe<T>) => U))
Type Parameters
- T
- U
Parameters
- orElseFn: (() => U)
  - - (): U
    - Returns U
Returns ((mapFn: ((t: T) => U)) => ((maybe: Maybe<T>) => U))
- - (mapFn): ((maybe: Maybe<T>) => U)
  - Parameters
    - mapFn: ((t: T) => U)
      (t): U
      Parameters
      t: T
      Returns U
    Returns ((maybe: Maybe<T>) => U)
    - - (maybe): U
      - Parameters
        maybe: Maybe<T>
        Returns U
- Defined in maybe.ts:589