Function and

and<U>(optB): (<T>(optA) => Option<U>)
Returns None if optA is None, otherwise returns optB. The order of arguments is reversed because of that it is useful for partial applying.
Type Parameters
- U
Parameters
- optB: Option<U>
  The second optional when used optA is Some.
Returns (<T>(optA) => Option<U>)
optB or a None.

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

assertEquals(and(none())(none()), none());
assertEquals(and(none())(some(2)), none());
assertEquals(and(some("foo"))(none()), none());
assertEquals(and(some("foo"))(some(2)), some("foo"));
```
- - <T>(optA): Option<U>
  - Type Parameters
    - T
    Parameters
    - optA: Option<T>
    Returns Option<U>
- Defined in src/option.ts:287

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