typed-utilities/build/__tests__/Option.test.js

Strongly typed general purpose utilities

"use strict";

var _ = require("..");

test(`Option`, () => {
  expect(_.Option.is.some(_.Option.of.some(1))).toEqual(true);
  expect(_.Option.is.none(_.Option.of.some(1))).toEqual(false);
  expect(() => _.Option.assert.some(_.Option.of.some(1))).not.toThrow();
  expect(() => _.Option.assert.none(_.Option.of.some(1))).toThrow();
  expect(_.Option.is.some(_.Option.of.none())).toEqual(false);
  expect(_.Option.is.none(_.Option.of.none())).toEqual(true);
  expect(() => _.Option.assert.some(_.Option.of.none())).toThrow();
  expect(() => _.Option.assert.none(_.Option.of.none())).not.toThrow();
  expect(_.Option.to.someValue(_.Option.of.some(1))).toEqual(1);
  const t1 = [1, 2, 3].map(_.Option.of.some);

  for (const m of t1) {
    expect(_.Option.is.some(m));
  }

  const keepOdd = v => v % 2 === 1 ? _.Option.of.some(v) : _.Option.of.none();

  const t2 = t1.map(m => _.Option.match(m, {
    some: keepOdd,
    none: _.Option.of.none
  }));
  expect(t2).toEqual([_.Option.of.some(1), _.Option.of.none(), _.Option.of.some(3)]);
  expect(t2.filter(_.Option.is.some).map(_.Option.to.someValue)).toEqual([1, 3]);
});
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