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JavaScript Constructor Method
Constructor method in JavaScript
A JavaScript constructor method is basically a distinctive type of method that is used to initialize and create an object and is called whenever a memory is allocated for an object.
Please note these are some points that should be kept in mind:
- In order to declare a constructor method, constructor keyword is used.
- The class can only have one constructor method.
- Use of parent class constructor through super keyword is allowed by the JavaScript.
Examples of Constructor Methods
Example 1. Here is an example of constructor method
<script>
class Employee
{
constructor()
{
this.id=11;
this.name = "Sonu Chowdhary";
}
}
var emp = new Employee();
document.writeln(emp.id+" "+emp.name);
</script>
Output :11 Sonu Chowdhary
Constructor Method Example: super keyword
2. Here is an example for the constructor method including super keyword:
<script>
class CompanyName
{
constructor()
{
this.company="Phptpoint";
}
}
class Employee extends CompanyName {
constructor(id,name) {
super();
this.id=id;
this.name=name;
}
}
var emp = new Employee(5,"Sonu");
document.writeln(emp.id+" "+emp.name+" "+emp.company);
</script>
Output :5 Sonu Phptpoint
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