Classes and objects in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a class named Person.

Flutter

class [1] {
  String name;
  Person(this.name);
}

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

AAnimal

BPerson

CCar

DWidget

Attempts:

3 left

💡 Hint

Common Mistakes

Using a class name that does not match the constructor.

Choosing unrelated class names.

The class name should be Person to match the constructor and represent a person.

2fill in blank

medium

Complete the code to create an object of the Person class.

Flutter

var person = [1]('Alice');

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

AAnimal

BWidget

CPerson

DCar

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong class name to create the object.

Forgetting to add parentheses.

To create an object, use the class name Person followed by parentheses with arguments.

3fill in blank

hard

Fix the error in the method to return the person's name.

Flutter

class Person {
  String name;
  Person(this.name);

  String getName() {
    return [1];
  }
}

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

Athis.name

Bname()

CgetName

DPerson.name

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to call name as a function.

Using class name to access instance variable.

Use this.name or simply name to access the instance variable inside the class.

4fill in blank

hard

Fill both blanks to add an age property and initialize it in the constructor.

Flutter

class Person {
  String name;
  int [1];

  Person(this.name, this.[2]);
}

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

Aage

Bheight

Cweight

Dscore

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for property and constructor parameter.

Choosing unrelated property names.

The property and constructor parameter should both be named age to store the person's age.

5fill in blank

hard

Fill all three blanks to create a method that returns a greeting with the person's name and age.

Flutter

class Person {
  String name;
  int age;

  Person(this.name, this.age);

  String greet() {
    return 'Hello, my name is $[1] and I am $[2] years [3].';
  }
}

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

Aname

Bage

Cold

Dyears

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names.

Forgetting to use the word 'old' in the sentence.

The method uses name and age variables and the word old to form the greeting sentence.