toContain Vs. toContainEqual

The different usage between these two Jest matchers:

• use toContain to verify the elements of an array or a string

  test('a specific blog is within returned blogs list', async () => {
      const response = await api.get('/api/blogs')
      const blogTitles = response.body.map(r => r.title)
      expect(blogTitles).toContain('CSS Tricks')
    })
  

• use toContainEqual to verify the objects in an arrays

  describe('my beverage', () => {
    test('is delicious and not sour', () => {
      const myBeverage = {delicious: true, sour: false};
      expect(myBeverages()).toContainEqual(myBeverage);
    });
  });