function checkPasswordStrength(password) {

  // Create an object to store the criteria that the password needs to meet

  const criteria = {

    length: false,

    uppercase: false,

    lowercase: false,

    number: false,

    specialChar: false,

  };

​

  // Check if the password meets each criteria

  if (password.length >= 8) {

    criteria.length = true;

  }

​

  if (/[A-Z]/.test(password)) {

    criteria.uppercase = true;

  }

​

  if (/[a-z]/.test(password)) {

    criteria.lowercase = true;

  }

​

  if (/\d/.test(password)) {

    criteria.number = true;

  }

​

  if (/[$@!%*?&]/.test(password)) {

    criteria.specialChar = true;

  }

​

  // Calculate the number of criteria met

  const numCriteriaMet = Object.values(criteria).filter(Boolean).length;

​

  // Return the strength of the password based on the number of criteria met

  switch (numCriteriaMet) {

    case 1:

      return 'Weak';

    case 2:

      return 'Moderate';

    case 3:

      return 'Strong';

    case 4:

      return 'Very strong';

    case 5:

      return 'Extremely strong';

    default:

      return 'Invalid password';

  }

}