chore: import upstream snapshot with attribution

curriculum/challenges/english/blocks/quiz-javascript-classes/67358ac128957c865dcf3ddf.md

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+---
+id: 67358ac128957c865dcf3ddf
+title: JavaScript Classes Quiz
+challengeType: 8
+dashedName: quiz-javascript-classes
+---
+
+# --description--
+
+To pass the quiz, you must correctly answer at least 18 of the 20 questions below.
+
+# --quizzes--
+
+## --quiz--
+
+### --question--
+
+#### --text--
+
+What is the purpose of a class in JavaScript?
+
+#### --distractors--
+
+To define only properties, not methods.
+
+---
+
+To define static variables only.
+
+---
+
+To organize only primitive data.
+
+#### --answer--
+
+To create reusable blueprints for objects.
+
+### --question--
+
+#### --text--
+
+How do you define a class in JavaScript?
+
+#### --distractors--
+
+Using the `className` keyword.
+
+---
+
+Using the `object` keyword.
+
+---
+
+Using the `constructor` keyword only.
+
+#### --answer--
+
+Using the `class` keyword.
+
+### --question--
+
+#### --text--
+
+Which method is used in a class to initialize properties?
+
+#### --distractors--
+
+`static`
+
+---
+
+`init`
+
+---
+
+`define`
+
+#### --answer--
+
+`constructor`
+
+### --question--
+
+#### --text--
+
+What does `this` represent inside a class constructor?
+
+#### --distractors--
+
+The global class object.
+
+---
+
+The function itself.
+
+---
+
+An undefined reference.
+
+#### --answer--
+
+An instance of the class.
+
+### --question--
+
+#### --text--
+
+Which of the following describes how `this` behaves in an arrow function inside a class method?
+
+#### --distractors--
+
+It inherits the value of `this` from the nearest function in a different scope.
+
+---
+
+It refers to a newly created instance of the class.
+
+---
+
+It inherits the value of `this` from the global object in strict mode.
+
+#### --answer--
+
+It inherits the value of `this` from the enclosing scope where it is defined.
+
+### --question--
+
+#### --text--
+
+What is the primary purpose of the `extends` keyword?
+
+#### --distractors--
+
+To define static methods in a parent class constructor.
+
+---
+
+To create a method in a class.
+
+---
+
+To initialize default properties in the parent class.
+
+#### --answer--
+
+To create a subclass that inherits from a parent class.
+
+### --question--
+
+#### --text--
+
+Which of the following is an example of how to create a `Car` class that inherits from a `Vehicle` class?
+
+#### --distractors--
+
+`class Car uses Vehicle {}`
+
+---
+
+`class Car = Vehicle {}`
+
+---
+
+`class Car inherits Vehicle {}`
+
+#### --answer--
+
+`class Car extends Vehicle {}`
+
+### --question--
+
+#### --text--
+
+What is the output of the following code?
+
+```javascript
+class Animal {
+  speak() {
+    return "Animal speaks";
+  }
+}
+
+class Dog extends Animal {
+  speak() {
+    return "Dog barks";
+  }
+}
+
+const myDog = new Dog();
+console.log(myDog.speak());
+```
+
+#### --distractors--
+
+`Animal speaks`
+
+---
+
+An error is raised.
+
+---
+
+`undefined`
+
+#### --answer--
+
+`Dog barks`
+
+### --question--
+
+#### --text--
+
+What is the function of the `super` keyword in a subclass?
+
+#### --distractors--
+
+To define a new instance of the parent class.
+
+---
+
+To delete methods and properties from the parent class.
+
+---
+
+To access only the static methods of the parent class.
+
+#### --answer--
+
+To call the constructor or methods of the parent class.
+
+### --question--
+
+#### --text--
+
+Which of the following describes a static method?
+
+#### --distractors--
+
+A method that is inaccessible inside the class itself.
+
+---
+
+A method that is used only in arrow functions.
+
+---
+
+A method that is unique to each instance of a class.
+
+#### --answer--
+
+A method that belongs to the class itself, not to any instance.
+
+### --question--
+
+#### --text--
+
+What will the following code output?
+
+```js
+class Calculator {
+  static add(a, b) {
+    return a + b;
+  }
+}
+
+console.log(Calculator.add(3, 4));
+```
+
+#### --distractors--
+
+An error is raised.
+
+---
+
+`undefined`
+
+---
+
+`NaN`
+
+#### --answer--
+
+`7`
+
+### --question--
+
+#### --text--
+
+How would you access a static property in JavaScript class?
+
+#### --distractors--
+
+By using `this.propertyName` within a method.
+
+---
+
+By using `instance.propertyName` after creating an instance.
+
+---
+
+By using `super.propertyName` within a subclass.
+
+#### --answer--
+
+By using `ClassName.propertyName`.
+
+### --question--
+
+#### --text--
+
+In which scenario would you use a static method over an instance method?
+
+#### --distractors--
+
+When you need to access and modify the instance's properties.
+
+---
+
+When the method needs to be called on an object instance.
+
+---
+
+When the method doesn't rely on instance-specific data and operates on class-level data.
+
+#### --answer--
+
+When the method operates on data that is shared by all instances of the class.
+
+### --question--
+
+#### --text--
+
+What will the following code output?
+
+```js
+class MyClass {
+  sayHello() {
+    return "Hello!";
+  }
+}
+
+console.log(MyClass.sayHello());
+```
+
+#### --distractors--
+
+`Hello!`
+
+---
+
+`null`
+
+---
+
+`undefined`
+
+#### --answer--
+
+It throws an error.
+
+### --question--
+
+#### --text--
+
+What keyword is used to inherit properties and methods from another class?
+
+#### --distractors--
+
+`import`
+
+---
+
+`inherit`
+
+---
+
+`static`
+
+#### --answer--
+
+`extends`
+
+### --question--
+
+#### --text--
+
+What is printed by the following code?
+
+```js
+class Person {
+  static species = "Human";
+}
+
+console.log(Person.species);
+```
+
+#### --distractors--
+
+`undefined`
+
+---
+
+`null`
+
+---
+
+An error is raised.
+
+#### --answer--
+
+`Human`
+
+### --question--
+
+#### --text--
+
+Which of the following best describes inheritance?
+
+#### --distractors--
+
+It allows a method to return a new object.
+
+---
+
+It allows an instance to define its own properties.
+
+---
+
+It allows a static property to be converted into a non-static property.
+
+#### --answer--
+
+It allows a class to acquire properties and methods from another class.
+
+### --question--
+
+#### --text--
+
+What happens if a constructor is not defined in a subclass?
+
+#### --distractors--
+
+An error will be thrown.
+
+---
+
+The subclass will inherit the constructor from any class in the code.
+
+---
+
+The subclass cannot create new instances.
+
+#### --answer--
+
+The superclass's constructor will be used by default.
+
+### --question--
+
+#### --text--
+
+What does `this` represent in the following code?
+
+```js
+class Animal {
+  constructor(name) {
+    this.name = name;
+  }
+}
+```
+
+#### --distractors--
+
+The global object.
+
+---
+
+The `Animal` class itself.
+
+---
+
+An undefined variable.
+
+#### --answer--
+
+The instance of `Animal`.
+
+### --question--
+
+#### --text--
+
+What is the primary use of static properties?
+
+#### --distractors--
+
+To define default properties for each class instance.
+
+---
+
+To override methods in a subclass.
+
+---
+
+To define instance-specific data.
+
+#### --answer--
+
+To store class-wide data shared across instances.