How to select nth item inside select element in cypress

say I have the HTML:

<select name="subject" data-testid="contact-us-subject-field">
  <option value="What is this regarding?">What is this regarding?</option>
  <option value="Partnerships">Partnerships</option>
  <option value="Careers">Careers</option>
  <option value="Press">Press</option>
  <option value="Other">Other</option>
</select>

Selecting an option with a known value, such as 'Careers' is as easy as:

cy.get('[data-testid="contact-us-subject-field"]').select('Careers');

How do I select the nth option in this field, regardless of its value?

Solution 1:

Update

As pointed out by @dpstree in the comments, this doesn't answer the original question. Please see more recent answers for a complete solution.

Original

By using eq

cy.get('tbody>tr').eq(0)    // Yield first 'tr' in 'tbody'
cy.get('ul>li').eq(4)       // Yield fifth 'li' in 'ul'

Solution 2:

In the particular context of selecting the nth option, this may be appropriate:

cy.get('select[name=subject] > option')
  .eq(3)
  .then(element => cy.get('select[name=subject]').select(element.val()))

Solution 3:

Based on solution from Miguel Rueda, but using prevSubject option:

Cypress.Commands.add(
  'selectNth',
  { prevSubject: 'element' },
  (subject, pos) => {
    cy.wrap(subject)
      .children('option')
      .eq(pos)
      .then(e => {
        cy.wrap(subject).select(e.val())
      })
  }
)

Usage:

cy.get('[name=assignedTo]').selectNth(2)

Explanation:

Using children('option') and .eq(pos) traverse children of select to specific element.
Call select method with value of selected element.