DTO pattern for data transfer in Express - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a simple DTO class in Express.

Express

class UserDTO {
  constructor(user) {
    this.id = user.[1];
  }
}

Drag options to blanks, or click blank then click option'

Apassword

Bname

Cid

Demail

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing sensitive data like password

Using full user object instead of selected fields

The DTO class copies only the id property from the user object to transfer minimal data.

2fill in blank

medium

Complete the code to create a DTO instance from a user object.

Express

const userDTO = new UserDTO({ id: 1, name: 'Alice', email: '[e-mail]' });
console.log(userDTO.[1]);

Drag options to blanks, or click blank then click option'

Aid

Bpassword

Cemail

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to access properties not defined in the DTO

Using full user object properties

The DTO instance exposes the id property, which was copied from the user object.

3fill in blank

hard

Fix the error in the DTO class to correctly assign the email property.

Express

class UserDTO {
  constructor(user) {
    this.email = user.[1];
  }
}

Drag options to blanks, or click blank then click option'

AemailAddress

Bemail

Cmail

DuserEmail

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect property names

Assuming different naming conventions

The user object property is named email, so the DTO must use the same name to assign it correctly.

4fill in blank

hard

Fill both blanks to create a DTO that includes id and email from the user object.

Express

class UserDTO {
  constructor(user) {
    this.[1] = user.id;
    this.[2] = user.email;
  }
}

Drag options to blanks, or click blank then click option'

Aid

Bemail

Cname

Dpassword

Attempts:

3 left

💡 Hint

Common Mistakes

Including sensitive data like password

Mixing property names

The DTO copies id and email properties to transfer only necessary data.

5fill in blank

hard

Fill all three blanks to create a DTO that includes id, name, and email from the user object.

Express

class UserDTO {
  constructor(user) {
    this.[1] = user.id;
    this.[2] = user.name;
    this.[3] = user.email;
  }
}

Drag options to blanks, or click blank then click option'

Aid

Bname

Cemail

Dpassword

Attempts:

3 left

💡 Hint

Common Mistakes

Including password

Mixing property names or order

The DTO copies id, name, and email properties to transfer user data safely without sensitive info.