In JavaScript, hoisting allows you to use functions and variables before they're declared. When the JavaScript engine executes the JavaScript code, it creates the global execution context. The global execution context has two phases: Creation Execu...
In Javascript, everything is an Object. In other object-oriented programming languages, the this keyword always refers to the current instance of the class. Whereas in JavaScript, the value this depends on how a function is called. const person = { f...
A function that takes another function as an argument or returns a function as its results are known as a higher-order function. let's take an example. function x(){ console.log("Hi"); function y(x){ x(); } Suppose, I have an array of numbers. I wa...
var, let and const are keywords that are used to define variables in javascript. Let's understand the difference between these keywords. We will learn about scope, re-declaration and reinitialization, and hoisting with var, let and const. var Scope ...
map, filter and reduce are higher-order functions in javascript. Each one will iterate over an array and perform a transformation or computation. Each will return a new array based on the result of the function. map() The map() is used to transform a...
Promise is an object representing the eventual completion or failure of an asynchronous operation.
