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Another method other than a constructor in a JavaScript class?
In this artcle we are going to learn another method other than a constructor in a JavaScript class with suitable examples in JavaScript
The Constructor is used to create and initialize an instance of a class i.e., object. The constructor's job is to build a new object and set values for any attributes that already exist on the object. Every class has a default constructor. If we don't provide our own constructor, then the default constructor will be incoked.
Let's understand this concept in a better way with the help of suitable examples further in this article.
Syntax
The syntax for a constructor is ?
Constructor(); // No parameters Constructor(param1); //One parameter constructor Constructor(param1,param2,?,paramN) // N-parameter constructor.
Param1, param2, ?paramN are the parameters passed to the constructor.
Example 1
This is an example program to write a method other than a constructor.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Another method other than a constructor in a JavaScript class</title>
</head>
<body style="text-align: center ;">
<p> Another method other than a constructor in a JavaScript class </p>
<p id="method"></p>
<script>
class Person {
constructor(name){
this.name = name;
}
PersonName() {
return 'The person name is : '+this.name;
}
}
person_1 = new Person("Raghu");
document.getElementById("method").innerHTML = person_1.PersonName();
</script>
</body>
</html>
On executing the above code, the below output is generated.
Example 2
This is an example program to illustrate the usage of method other than a constructor. Instead of using the default constructor for initialization, we used a user-defined method called PersonDetails().
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Another method other than a constructor in a JavaScript class</title>
</head>
<body style="text-align: center ;">
<p> Another method other than a constructor in a JavaScript class </p>
<p id="method"></p>
<script>
class Person {
constructor(name, EmployeeID, designation) {
this.name = name;
this.EmployeeID = EmployeeID;
this.designation = designation;
}
PersonDetails() {
return this.name + " has the designation : " + this.designation;
}
}
person_1 = new Person("Rajesh", "10023", "Software Engineer");
document.getElementById("method").innerHTML = person_1.PersonDetails();
</script>
</body>
</html>
On executing the above code, the below output is generated.
Example 3
In the following example, rather than using the default method constructor() the properties were actually initialized in a user given method called "anotherMet()". Through this method, the actual result is executed in the output as shown.
<html>
<body>
<p id="method"></p>
<script>
class Company {
constructor(branch) {
this.name = branch;
}
anotherMet(x) {
return x + " is the head of " + this.name;
}
}
myComp = new Company("Microsoft.");
document.getElementById("method").innerHTML = myComp.anotherMet("Bill gates");
</script>
</body>
</html>
On executing the above code, the below output is generated.
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