│Consistency Meets Clarity

let userData = [];

/**

 * Retrieves a user by their ID.

 * @param {number} id - The ID of the user to retrieve.

 * @returns {Object|null} The user object if found, otherwise null.

 */

function getUserById(id) {

  for (let i = 0; i < userData.length; i++) {

    if (userData[i].id === id) {

      return userData[i];

    }

  }

  return null;

}

/**

 * Updates a user by their ID with new data.

 * @param {number} id - The ID of the user to update.

 * @param {Object} newData - The new data to update the user with.

 */

function updateUser(id, newData) {

  for (let i = 0; i < userData.length; i++) {

    if (userData[i].id === id) {

      userData[i] = { ...userData[i], ...newData };

    }

  }

}