OOP – Classes & Objects
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Does class declare a blueprint for creating objects?
2. Does new create an instance of a class?
3. Must 'class' be written in lowercase?
4. Must 'new' be written in lowercase?
5. Is 'Class' with a capital C valid JavaScript syntax?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1class Dog { name = "Rex"; } | AWrong - 'class' must be lowercase | |
| 2new Dog() | Bclass | |
| 3Declares a reusable blueprint for creating objects | CWrong - 'new' must be lowercase | |
| 4Creates an instance of a class | DCreates a new instance of the Dog class | |
| 5Class Dog { name = "Rex"; } | EDeclares a blueprint for creating Dog objects | |
| 6let d = New Dog(); | Fnew |
C
Definitions
class
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
_____ Dog {
2.
let myDog = ___ Dog();
3.
class Cat _
4.
let c = ___ Cat();
5.
class Bird _
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
Class Dog {
B
name = "Rex";
C
}
Question 2
A
class Cat {
B
name = "Tom"
C
}
Question 3
A
class Bird {
B
name = "Tweety";
C
]
Question 4
A
class Fish {
B
name = "Nemo";
C
}
D
let f = New Fish();
Question 5
A
clas Dog {
B
name = "Rex";
C
}
Answer Key
OOP – Classes & Objects
Section A: Quick Questions
Q1
A — Yes
Q2
B — Yes
Q3
A — Yes
Q4
A — Yes
Q5
B — No
Section B: Match the Pairs
Q1
class Dog { name = "Rex"; } → Declares a blueprint for creating Dog objects
Q2
new Dog() → Creates a new instance of the Dog class
Q3
Declares a reusable blueprint for creating objects → class
Q4
Creates an instance of a class → new
Q5
Class Dog { name = "Rex"; } → Wrong - 'class' must be lowercase
Q6
let d = New Dog(); → Wrong - 'new' must be lowercase
Section C: Definitions
Q1
class — Declares a blueprint for creating objects with shared properties and methods.Section D: Fill in the Blanks
Q1
class Dog {Q2
let myDog = new Dog();Q3
class Cat {Q4
let c = new Cat();Q5
class Bird {Section E: Spot the Error
Q1
A — 'class' must be lowercase - a capital C causes an error.
Q2
B — This line is missing a semicolon, but that's not required in JS.
Q3
C — The class body must close with }, not ].
Q4
D — 'new' must be lowercase - a capital N causes an error.
Q5
A — 'class' is misspelled as 'clas'.