Function countItemsNegativeZero

packages/diff-sequences/src/__tests__/index.test.ts:280–293

(aLength: number, bLength: number)

  describe('negative zero is equivalent to zero for length', () => {
    const countItemsNegativeZero = (aLength: number, bLength: number) => {
      let n = 0;
      diff(
        aLength,
        bLength,
        () => {
          throw new Error('input function should not have been called');
        },
        nCommon => {
          n += nCommon;
        },
      );
      return n;
    };

    test('of a', () => {
      expect(countItemsNegativeZero(-0, 1)).toBe(0);