What is Polymorphism in JavaScript?
Polymorphism is a concept in object-oriented programming that refers to the ability of objects of different classes to respond to the same method call in a way that is appropriate…
Arrow Functions vs. Regular Functions in JavaScript
In JavaScript, you can define functions in two different ways: with regular function syntax, and with arrow function syntax. Both regular functions and arrow functions serve the same purpose, but…
What is the use of “use strict” in JavaScript?
The “use strict” directive is a way to opt in to a “strict” mode of JavaScript, which is a version of the language that has more stringent rules and restrictions….
What is refresh token?
A refresh token is a type of token that is used to obtain a new access token. Access tokens have a limited lifetime, after which they expire and are no…
What is JWT?
JWT (JSON Web Token) is an open standard that defines a compact and self-contained way of transmitting information securely between parties as a JSON object. JWTs are often used for…
What is stack and queue in JavaScript?
A stack and a queue are both data structures that allow you to store and manipulate elements in a specific order. A stack is a collection of elements that follows…
How to push value in array as a particular index?
In JavaScript, you can use the splice() method to insert an element into an array at a specified index. The splice() method modifies the original array and adds or removes…
Why const value is not changed but alter const object value?
In JavaScript, a constant declared using the const keyword cannot be reassigned, but the properties of the object assigned to a const variable can be altered. This is because const…
What is shallow copy and deep copy in JavaScript?
In JavaScript, a shallow copy is a copy of an object that contains references to the same objects as the original object, rather than copies of the objects themselves. This…
What is rest and spread operator in JavaScript?
The “rest” operator and the “spread” operator are two important features in JavaScript that allow you to work with arrays and objects in a more convenient and efficient way. The…
What is call by reference and call by value in JavaScript?
In JavaScript, function arguments are passed by value, not by reference. This means that when you pass an argument to a function, a copy of the value is passed, not…
Write a program binary search in JavaScript?
Binary search is an efficient algorithm for finding an item from a sorted list of items. The basic idea behind binary search is to divide the list into halves repeatedly…
What is data type in JavaScript and how many types?
In JavaScript, a data type is a type of value that can be stored in a variable. There are a total of 7 data types in JavaScript: There are two…
Closure function example and write program in JavaScript?
A closure function is a function that has access to variables in its outer scope, even after the outer function has returned. This is useful for maintaining state and for…
What will be the output of the following code and why:
This code defines an anonymous self-executing function that declares a variable a and assigns it the value of b, which is in turn assigned the value of 5. When you…