Updated fourPillarsOfOOP.js #59
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MadaZZ
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Oct 19, 2020
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| and validate it. To achieve an encapsulation in JavaScript we use var keyword to make data members private and use setter methods | ||
| to set the data and getter methods to get that data. */ | ||
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| class Student | ||
| { | ||
| constructor() | ||
| { | ||
| var name; | ||
| var rollno; | ||
| } | ||
| getName() | ||
| { | ||
| return this.name; // to fetch name of student | ||
| } | ||
| setName(name) | ||
| { | ||
| this.name=name; // to store name in it | ||
| } | ||
| getMarks() | ||
| { | ||
| return this.marks; // to fetch marks of student | ||
| } | ||
| setMarks(marks) | ||
| { | ||
| this.marks=marks; // to stores marks of student | ||
| } | ||
| } | ||
| var stud=new Student(); | ||
| stud.setName("Alicia"); | ||
| stud.setMarks(95); | ||
| console.log(stud.getName()+" "+stud.getMarks()); // prints name and marks of the student | ||
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| /* ABSTRACTION - JavaScript abstraction is the process of hiding the implementation details and displaying only the functionality to all the users. | ||
| JavaScript Abstraction ignores the unnecessary details and displays only the necessary ones. */ | ||
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| class ImplementAbstraction { | ||
| // method to set values of internal members | ||
| set(x, y) { | ||
| this.a = x; // indirectly accessing private members | ||
| this.b = y; | ||
| } | ||
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| display() { | ||
| console.log('a = ' + this.a); | ||
| console.log('b = ' + this.b); | ||
| } | ||
| } | ||
| const obj = new ImplementAbstraction(); | ||
| obj.set(10, 20); | ||
| obj.display(); // a = 10 b = 20 | ||
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| /* INHERITANCE - The JavaScript inheritance is a mechanism that allows us to create new classes on the basis of already existing classes. | ||
| It provides flexibility to the child class to reuse the methods and variables of a parent class. | ||
| The JavaScript extends keyword is used to create a child class on the basis of a parent class. | ||
| It facilitates child class to acquire all the properties and behavior of its parent class.*/ | ||
| class Shoes | ||
| { | ||
| constructor() | ||
| { | ||
| this.company="Adidas"; | ||
| } | ||
| } | ||
| class Product extends Shoes { | ||
| constructor(name,price) { | ||
| super(); | ||
| this.name=name; | ||
| this.price=price; | ||
| } | ||
| } | ||
| var s = new Product("Sneakers","3000"); // constructor of sub-class is invoked | ||
| console.log(s.company+" "+s.name+" "+s.price); // prints company after inheriting it from parent class | ||
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| /* POLYMORPHISM - Polymorphism provides an ability to call the same method on different JavaScript objects */ | ||
| class A | ||
| { | ||
| display() | ||
| { | ||
| console.log("A is invoked"); // method for class A | ||
| } | ||
| } | ||
| class B extends A | ||
| { | ||
| display() | ||
| { | ||
| console.log("B is invoked"); //method for class B | ||
| } | ||
| } | ||
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| var a=[new A(), new B()] // creating instances of class A and B | ||
| a.forEach(function(msg) | ||
| { | ||
| msg.display(); //both the display functions will be called | ||
| }); |
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Everything is well explained.
I see that you have copied code from multiple sources.
Please mention those resources too.
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Sorry, forgot those. I have made the changes.
MadaZZ
requested changes
Oct 20, 2020
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| https://www.javatpoint.com/javascript-oops-abstraction | ||
| https://www.javatpoint.com/javascript-oops-polymorphism | ||
| https://www.javatpoint.com/javascript-oops-inheritance | ||
| https://www.javatpoint.com/javascript-oops-encapsulation | ||
| https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/Object-oriented_JS */ | ||
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| // FOUR PILLARS OF OBJECT ORIENTED PROGRAMMING |
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Oops... Please have a look at SampleJS.md
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Done! Is it fine now?
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