import * as O from "./optics.ts";
import { Option, match, some, none, map, fromPredicate } from "./option.ts";
import { pipe, identity } from "./fn.ts";

const { view, review, modify }: O.Iso<Option<number>, number> = O.iso(
  match(() => 0, identity),
  fromPredicate(n => n !== 0),
  map,
);

const result1 = view(some(1)); // 1
const result2 = view(none); // 0
const result3 = review(1); // Some(1)
const result4 = review(0); // None
const result5 = modify(n => n + 100)(some(1)); // Some(101)
const result6 = modify(n => n + 100)(none); // Some(100)