Javascript is based on the OOPs Concept, i.e., Javascript is an object-oriented programming language that uses classes and objects for computations. Polymorphism is the OOPs principle which provides the facility to perform one task in many ways. Sub-class object calls the parent class method example: <!DOCTYPE html> <html> <body> <script> class Welcome { show() { … Read more
The property of acquiring all the properties and behaviors of the parent object by an object is termed as inheritance. This is a unique feature in object-oriented programming languages that facilitates re-usability of the code of the parent class by the derived class. In JavaScript, extends keyword is used to serve the purpose of inheritance. … Read more
OOPs restrict direct access to its methods and variables by encapsulating the code and data together. In javascript, the data binds with the functions acting on that data in the process of achieving encapsulation in order to control the data and validate it. There are two ways of encapsulation in Javascript: Making data members private … Read more
Static methods in JavaScript is a way for providing class level methods. To declare a static method, we have to use static keyword as prefix with method name. Syntax: class className(){ static methodName(){ //method body } } Ways to call static methods 1. Using Class name ClassName.methodName(); 2. On the constructor property of the class … Read more
To initialize and create an object in Javascript, a constructor method is used which is called when memory is allocated for an object. A class in Javascript can contain one constructor method only, however, a parent class constructor can be used by using the super keyword. Example: <!DOCTYPE html> <html> <body> <script> class Student { … Read more
The dictionary meaning of Prototype: A first or preliminary version of a device or vehicle from which other forms are developed. A prototype-based language is one that facilitates the objects to obtain properties and features from one another. In JavaScript, each object contains a prototype object, and the prototype property is added to each function … Read more
Anything that has a state and behavior can be termed an Object, be it physical or logical. An Object is an entity mentioned in the OOPs concept and is frequently found in JavaScript codes. Creating an object in JavaScript is a direct phenomenon as JavaScript is a template-based language and is not based on classes. … Read more
According to Wikipedia: In object-oriented programming, a class is an extensible program-code-template for creating objects, providing initial values for state (member variables) and implementations of behavior (member functions or methods). A class in Javascript is a special type of function that contains various class members including methods or constructors. A class in JavaScript can be … Read more
JavaScript email validation: An email is tricky because of its format. Some of the basic checks are as follows: Presence of @ and . character Presence of at least one character before and after the @. Presence of at least two characters after. (dot). Example <!DOCTYPE html> <html lang=”en”> <head> <script> function validateEmail(emailId) { var … Read more
Form validation is the way of ensuring that form data entered by the user meets the specified criteria. Let us take the example of a registration form which needs a name, email ID, etc. We want that name not to contain any special characters and the email address should be a valid one like with … Read more