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

Strongly typed general purpose utilities

"use strict";

var _ = require("..");

test(`Either`, () => {
  expect(_.Either.is.left(_.Either.of.left(1))).toEqual(true);
  expect(_.Either.is.right(_.Either.of.left(1))).toEqual(false);
  expect(() => _.Either.assert.left(_.Either.of.left(1))).not.toThrow();
  expect(() => _.Either.assert.right(_.Either.of.left(1))).toThrow();
  expect(_.Either.to.leftValue(_.Either.of.left(1))).toEqual(1);
  expect(_.Either.is.left(_.Either.of.right(`1`))).toEqual(false);
  expect(_.Either.is.right(_.Either.of.right(`1`))).toEqual(true);
  expect(() => _.Either.assert.left(_.Either.of.right(`1`))).toThrow();
  expect(() => _.Either.assert.right(_.Either.of.right(`1`))).not.toThrow();
  expect(_.Either.to.rightValue(_.Either.of.right(`1`))).toEqual(`1`);
  const t1 = [1, 2, 3].map(_.Either.of.left);

  for (const m of t1) {
    expect(_.Either.is.left(m));
    expect(() => _.Either.assert.left(m)).not.toThrow();
    expect(() => _.Either.assert.right(m)).toThrow();
  }

  const keepOdd = v => v % 2 === 1 ? _.Either.of.left(v) : _.Either.of.right(`not odd`);

  const t2 = t1.map(m => _.Either.match(m, {
    left: keepOdd,
    right: _.Either.of.right
  }));
  expect(t2).toEqual([_.Either.of.left(1), _.Either.of.right(`not odd`), _.Either.of.left(3)]);
  expect(t2.filter(_.Either.is.left).map(_.Either.to.leftValue)).toEqual([1, 3]);
});
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