Function mapOrElse

mapOrElse<U>(fn): (<T>(f) => ((opt) => U))
Maps the optional value with a default value fn().
Type Parameters
- U
Parameters
- fn: (() => U)
  The function to provide a default value.
  - - (): U
    - Returns U
Returns (<T>(f) => ((opt) => U))
The mapped value or init.

Examples
```
import { some, mapOrElse, none } from "./option.ts";
import { assertEquals } from "../deps.ts";

const strLenOrCalc = mapOrElse(() => 6 ** 4)((str: string) => str.length);

assertEquals(strLenOrCalc(some("Hello, World!")), 13);
assertEquals(strLenOrCalc(none()), 1296);
```
- - <T>(f): ((opt) => U)
  - Type Parameters
    - T
    Parameters
    - f: ((t) => U)
      (t): U
      Parameters
      t: T
      Returns U
    Returns ((opt) => U)
    - - (opt): U
      - Parameters
        opt: Option<T>
        Returns U
- Defined in src/option.ts:680

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