As developers, we often come across scenarios where we need to call a method within a class. This can be a confusing concept for beginners, but it is an essential skill to have in order to write efficient and organized code. In this article, we will explore the concept of calling a class method within a class and how it can be implemented in HTML.
First, let's understand what a class method is. In simple terms, a class method is a function that is associated with a particular class. It is different from a regular function as it can only be called on an instance of that class. Think of it as a behavior or action that is specific to that class.
Now, let's delve into how we can call a class method within a class in HTML. We will be using the <script> tag to write our code, as it is used to define client-side JavaScript in HTML.
To create a class in HTML, we use the keyword "class" followed by the name of the class, enclosed in curly braces. Inside the curly braces, we can define the properties and methods of that class.
For example, let's create a class named "Car" with a method called "startEngine" that prints a message when called.
```
<script>
class Car {
startEngine() {
console.log("The engine has started.");
}
}
</script>
```
Now, to call this method within the class, we use the "this" keyword followed by the name of the method. The "this" keyword refers to the current instance of the class, which in this case is "Car".
```
<script>
class Car {
startEngine() {
console.log("The engine has started.");
}
// calling the startEngine method within the class
start() {
this.startEngine();
}
}
</script>
```
In the above example, we have created another method called "start" which calls the "startEngine" method using the "this" keyword. This is known as method chaining, where one method calls another method within the same class.
Now, let's see how we can call this class method outside of the class. To do this, we first need to create an instance of the class using the "new" keyword, followed by the name of the class.
```
<script>
class Car {
startEngine() {
console.log("The engine has started.");
}
}
// creating an instance of the Car class
let myCar = new Car();
</script>
```
Once we have created an instance, we can call the class method using the dot notation, followed by the name of the method.
```
<script>
class Car {
startEngine() {
console.log("The engine has started.");
}
}
// creating an instance of the Car class
let myCar = new Car();
// calling the startEngine method on the myCar instance
myCar.startEngine();
</script>
```
We can also pass arguments to the class method, just like we would in a regular function.
```
<script>
class Car {
startEngine(type) {
console.log(`The ${type} engine has started.`);
}
}
// creating an instance of the Car class
let myCar = new Car();
// calling the startEngine method on the myCar instance and passing "V8" as an argument
