Class methods and properties

What is method in class?

Methods are defined on the prototype of each class instance and shared by all instances. Class methods are functions that belong to a class and can be called on instances of that class.

We always add a constructor() method before adding any number of methods.

Syntax

class className{

constructor(){.....}

method1 () {.....}

method2 () {....}

}

Example

class Person{

constructor(name) {

this.name=name;

}

showName( ) {

console.log("Hello, my name is",this.name);

}

}

const person1=new Person("rahul");

person1.showName( );

Class methods can access properties of the class instances through the 'this' keyword.

Static methods in class

Static class methods are defined on the class itself. Static methods can be called without an instance of the class. They are typically used to implement utility functions that operate on class-level data.

Example

class Myclass {

static staticMethod( ) {

console.log(" This is static method trial");

}

}

Myclass.staticMethod( );

It is called by class name followed by method name.

Properties with initial values

When we make a class object, it may be chances that some properties may have an initial value. For example, if we make a class of beginner programmer, then the level of the programmer would be 0 and skills would be empty.

class Beginner{

constructor(fname,lname,age,city) {

this.fname=fname;

this.lname=lname;

this.age=age;

this.city=city;

this.level=0;

this.skills=[ ];

}

getfullname ( ) {

const fullname =this.fname + this.lname;

return fullname;

}

}

const person1=new Beginner('anuska', 'kumari', 33, 'Gonda');

console.log(person1.level); //accessing level property

console.log(person1.skills); //access skills property