pragmatic-fp-ts/deno_lib/__tests__/getValue.test.ts

Opinionated functional programming library with easy use in mind

import { chain, getValue, maybe } from "../main.ts";
import { nothing } from "../Maybe.ts";

describe("getValueOr()", () => {
  it("returns simple values", () => {
    expect(getValue(2)).toBe(2);
  });

  it("returns values from monads", () => {
    expect(getValue(chain(2))).toBe(2);
    expect(getValue(maybe(2))).toBe(2);
    expect(getValue(maybe(2)._(() => null as any))).toBe(null);
    expect(getValue(nothing())).toBe(null);
  });
});