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abstract classes in js

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Ahmad Mujtaba answered on March 5, 2021 Popularity 9/10 Helpfulness 2/10

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abstract classes in js

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<!DOCTYPE html>
<html>
<body>
<script>
class Employee
{
constructor() {
if(this.constructor == Employee){
throw new Error(" Object of Abstract Class cannot be created");
}
}
display(){
throw new Error("Abstract Method has no implementation");
}
}
class Manager extends Employee
{
display(){
//super.display();
console.log("I am a Manager");
}
}
//var emp = new Employee;
var mang=new Manager();
mang.display();
</script>
</body>
</html>

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: www.educba.com

Tags: javascript

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Contributed on Jan 17 2023

Ahmad Mujtaba

0 Answers Avg Quality 2/10

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Abstract class in js

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class Employee
{
  constructor() {
    if(this.constructor == Employee){
    throw new Error(" Object of Abstract Class cannot be created");
    }
  }
  display() {
    	throw new Error("Abstract Method has no implementation");
    }
  }
  class Manager extends Employee
  {
    display(){
    //super.display();
    console.log("I am a Manager");
  }
}

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: www.educba.com

Tags: abstract-class abst

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Contributed on Oct 18 2022

Creepy Caribou

0 Answers Avg Quality 2/10

javascript abstract class

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//there is no way to mark a class as abstract in ES6,
//however you can force a class to behave line one by
//	- forcing derived classes to override a method
//	- causing the base class's contructor to throw an error so that it
//			is never used to create instances of the base type*
// *Be careful, as this will cause problems if you do need derived classes
// 	to call super() contructor
class Foo {
 
    constructor(text){
       this._text = text;
    }
 
    /**
     * Implementation optional
     */
    genericMethod() {
        console.log('running from super class. Text: '+this._text);
    }
    
    /**
     * Implementation required
     */
    doSomething() {
       throw new Error('You have to implement the method doSomething!');
    }
 
}
 
class Bar extends Foo {
 
    constructor(text){
       super(text);
    }
 
    genericMethod() {
        console.log('running from extended class. Text: '+this._text);
    }
    
    doSomething() {
       console.log('Method implemented successfully!');
    }
    
}
 
let b = new Bar('Howdy!');
b.genericMethod(); //gonna print: running from extended class. Text: Howdy
b.doSomething(); //gonna print: Method implemented successfully!

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: www.google.com

Tags: abstract-class abst

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Contributed on Mar 05 2021

Solstice

0 Answers Avg Quality 2/10

abstract classes in js

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