tamda/src/list/reverse.spec.ts

Practical functional programming library for TypeScript

import { reverse } from './reverse';

describe('reverse', () => {
  it('should immutably reverse the items in an array', () => {
    const array = [1, 2, 3];

    const results = [
      reverse(array),
      reverse () (array),
    ];

    results.forEach(result => {
      expect(result).toEqual([3, 2, 1]);
      expect(result).not.toBe(array);
    });
  });
});