OOP – Methods

A function declared inside a class body, called on an instance using dot notation.

Part of: JavaScript Coding without HTML and CSS — Module 49, ACARA Digital Technologies Years 9–10 — Modular and Object-Oriented Programming (JavaScript) — Module 58

Understanding OOP – Methods in JavaScript

What it does: This is exactly how a method is written inside a class body. this lets a method access that instance's own properties. Methods define behavior that instances of the class can use. Methods are written as name() { ... }, without 'function'. myDog.bark() calls the bark method on the myDog instance. Without (), you're only referring to the method, not calling it. this.name refers to the current instance's name property. bark() and Bark() would be treated as two different names.

Common mistakes: Method names are case-sensitive - it should be bark(), not Bark(). Calling a method needs parentheses: myCat.meow().

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This module's key terms are also in a printable crossword (Modules 41–52) and word search (Modules 21–52).

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Each concept is reinforced from every angle — learned, then applied, then tested.

Learning

Duo

Is a method a function declared inside a class body?

YesNo

Matches

function bark() { console.log("woof"); }

↓

Wrong - class methods don't use the 'function' keyword

Applying

Meanings

Term

method

Meaning

A function declared inside a class body, called on an instance using dot notation.

Practice

class Dog {

Testing

Gaps

() {

Check Answer

Spots

1myDog.Bark();

2let myDog = new Dog();

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Quick Questions

1. Is a method a function declared inside a class body?

A. No

B. Yes ✓

Methods define behavior that instances of the class can use.

2. Do class methods use the 'function' keyword?

A. Yes

B. No ✓

Methods are written as name() { ... }, without 'function'.

3. Is a method called on an instance using dot notation?

A. Yes ✓

B. No

myDog.bark() calls the bark method on the myDog instance.

4. Does calling a method require parentheses?

A. Yes ✓

B. No

Without (), you're only referring to the method, not calling it.

5. Can 'this' be used inside a method to access the instance's properties?

A. Yes ✓

B. No

this.name refers to the current instance's name property.

Match the Pairs

bark() { console.log(this.name + " says woof"); } → Declares a method that prints the dog's name and a sound

myDog.bark(); → Calls the bark method on the myDog instance

A function declared inside a class, without 'function' → show() { ... }

Refers to the instance a method is called on → this

function bark() { console.log("woof"); } → Wrong - class methods don't use the 'function' keyword

myDog.bark; → Wrong - calling a method needs parentheses

Key Term

method

A function declared inside a class body, called on an instance using dot notation.

Fill in the Blanks

1. bark() { console.log(this.name + " says woof"); }

Hint: Type the method name declared inside the class.

2. myDog.bark();

Hint: Type the method name being called on myDog.

3. show() { console.log(this.color); }

Hint: Type the method name declared inside the class.

4. myCar.show();

Hint: Type the method name being called on myCar.

5. console.log(this.name + " says woof");

Hint: Type the keyword that refers to the current instance.

Spot the Error

Question 1

A myDog.Bark();

B let myDog = new Dog();

C class Dog {

D bark() { console.log(1); }

E }

Line A — Method names are case-sensitive - it should be bark(), not Bark().

Question 2

A myCat.meow;

B let myCat = new Cat();

C class Cat {

D meow() { console.log(2); }

E }

Line A — Calling a method needs parentheses: myCat.meow().

Question 3

A class Bird {

B function sing() {

C console.log("tweet");

D }

E }

Line B — Class methods skip the 'function' keyword - just write sing() {.

Question 4

A class Duck {

B function quack() {

C console.log("quack");

D }

E }

Line B — Class methods skip the 'function' keyword - just write quack() {.

Question 5

A class Fish {

B swim() {

C console.log("splash")

D }

E }

Line C — This line is missing a semicolon, but that's not required in JS.

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