SOLID Single responsibility principle

/* S.O.L.I.D. */

/* Single responsiblitiy prinicple
- everything should only have one reason to change */

/* BAD */
class UserSettings {
  constructor(user) {
    this.user = user
  }

  changeSettings(settings) {
  if (this.verifyCredentials()) {
    //...
    }
  }

  verifyCredentials() {
    //...
  }
}

/* GOOD */
class UserAuth {
  constructor(user) {
    this.user = user
  }

  verifyCredentials() {
    //...
  }
}

class UserSettings {
    constructor(user) {
  this.user = user;
  this.auth = new UserAuth(user);
  }

  changeSettings(settings) {
    if (this.auth.verifyCredentials()) {
        //...
    }
  }
}