export default function compact(arr) {
  // TODO: Remove all falsy values from the array
  throw new Error('Not implemented');
}

import compact from './compact';

describe('compact', () => {
  test('removes common falsy values', () => {
    expect(compact([0, 1, false, 2, '', 3])).toEqual([1, 2, 3]);
  });

  test('returns same values when all entries are truthy', () => {
    expect(compact(['a', true, 42])).toEqual(['a', true, 42]);
  });

  test('removes null, undefined, and NaN', () => {
    expect(compact([null, undefined, NaN, 'x'])).toEqual(['x']);
  });

  test('handles empty array', () => {
    expect(compact([])).toEqual([]);
  });
});