Code Quality Test (Choose one of the files below)

test.js

'use strict';

// This class is used for logins
class Login {
  constructor(hash) {
    this.sessions = [];
    this.users = [];
    this.passwords = [];
    Object.keys(hash).map(k => ({k, v: hash[k]})).map(e => {
      this.users = this.users.concat([e.k]);
      this.passwords = this.passwords.concat([e.v]);
    });
  }

  logout(user) {
    this.sessions.forEach((session, i) => {
      if (session === user) {
        this.sessions[i] = null;
      }
    });
    this.sessions = this.sessions.filter(session => session !== null);
  }

  // Checks if user exists
  userExists(user) {
    // Temp variable for storing the user if found
    let temp = '';
    for (let i of this.users) {
      if (i === user) {
        temp = user;
      }
    }
    let exists = (temp !== '' && temp === user);
    return exists;
  }

  // Register user
  registerUser(user, password) {
    let lastIndex = this.users.length;
    this.users[lastIndex] = user;
    this.passwords[lastIndex] = password;
  }

  removeUser(user) {
    let index = this.idx(user, this.users);
    this.users[index] = null;
    this.passwords[index] = null;
    this.users = this.users.filter(user => user !== null);
    this.passwords = this.passwords.filter(password => password !== null);
  }

  checkPassword(user, password) {
    let index = this.idx(user, this.users);
    let passwordCorrect = this.passwords[index] === password;
    return passwordCorrect;
  }

  updatePassword(user, oldPassword, newPassword) {
    // First we check if the user exists
    let user1 = '';
    for (let i of this.users) {
      if (i === user) {
        user1 = user;
      }
    }
    if (user1 === user) {
      let index = this.idx(user, this.users);
      if (this.passwords[index] === oldPassword) {
        this.passwords[index] = newPassword;
        return true;
      }
    }
    return false;
  }

  login(user, password) {
    let index = this.idx(user, this.users);
    if (this.passwords[index] === password) {
      this.sessions.push(user);
    }
  }

  // Gets index of an element in an array
  idx(element, array) {
    let cont=0;
    for (let i of array) {
      if (i === element) {
        return cont;
      }
      cont += 1;
    }
    return cont;
  }
}

let registeredUsers = {
  user1: 'pass1',
  user2: 'pass2',
  user3: 'pass3'
};

let login = new Login(registeredUsers);

login.registerUser('user4', 'pass4');
login.login('user4', 'pass4');
login.updatePassword('user3', 'pass3', 'pass5');
login.login('user3', 'pass5');
login.logout('user4');
login.logout('user3');

test.rb

# This class is used for logins
class Login
  attr_reader :sessions, :users, :passwords

  # Receives a hash with usernames as keys and passwords as values
  def initialize(hash)
    @sessions = []
    @users = []
    @passwords = []
    hash.map do |k,v|
      @users = @users + [k]
      @passwords = @passwords + [v]
    end
  end

  def logout(user)
    sessions.each_with_index do |session, i|
      sessions[i] = nil if session == user
    end
    sessions.compact!
  end

  # Checks if user exists
  def user_exists(user)
    # Temp variable for storing the user if found
    temp = ''
    for i in users
      if i == user
        temp = user
      end
    end
    exists = temp != '' && temp == user
    exists
  end

  # Register user
  def register_user(user, password)
    last_index = users.size
    users[last_index] = user
    passwords[last_index] = password
  end

  def remove_user(user)
    index = idx(user, users)
    users[index] = nil
    passwords[index] = nil
    users.compact!
    passwords.compact!
  end

  def check_password(user, password)
    index = idx(user, users)
    password_correct = passwords[index] == password
    return password_correct
  end

  def update_password(user, old_password, new_password)
    # First we check if the user exists
    user_1 = ''
    for i in users
      if i == user
        user_1 = user
      end
    end
    if user_1 == user
      index = idx(user, users)
      if passwords[index] == old_password
        passwords[index] = new_password
        return true
      end
    end
    return false
  end

  def login(user, password)
    index = idx(user, users)
    if passwords[index] == password
      sessions << user
    end
  end

  # Gets index of an element in an array
  def idx(element, array)
    cont=0
    for i in array
      return cont if i == element
      cont += 1
    end
    return cont
  end
end



registered_users = {
  'user1' => 'pass1',
  'user2' => 'pass2',
  'user3' => 'pass3'
}

login = Login.new(registered_users)

login.register_user('user4', 'pass4');
login.login('user4', 'pass4');
login.update_password('user3', 'pass3', 'pass5');
login.login('user3', 'pass5');
login.logout('user4');
login.logout('user3');