Atharv Gyan

To start a series for the JavaScript interview questions which may help junior to mid level developers. Common JavaScript interview questions with examples. 1. What is let and const in JavaScript? »  Let and const are block-scoped declarations in JavaScript, used to declare variables. let allows you to reassign the value of the variable, while const creates a read-only reference to a value. Example: let message = "Hello, World!"; message = "Hello, JavaScript!"; console.log(message); // Output: "Hello, JavaScript!" const PI = 3.14; PI = 3.14159; // TypeError: Assignment to constant variable. 2. What is arrow function in JavaScript? »   Arrow functions are a shorthand for anonymous functions in JavaScript. They are also known as “fat arrow” functions. Example: let add = (a, b) => a + b; console.log(add(1, 2)); // Output: 3 let numbers = [1, 2, 3, 4, 5]; let doubledNumbers = numbers.map(num => num * 2); console.log(doubledNumbers); // Output: [2, 4, 6,

  JavaScript is the programming language that lets the Internet work. The Internet would be nothing without JavaScript and in this lesson, you will find out why.  At the end of this article, you should be able to: understand what Javascript is and explain its use in web development. explain and use JavaScript primitive data types and variables. explain and use JavaScript functions as properties and methods on primitive data types. explain global object in JavaScript and be able to use the Math object. explain basic control flow and if/else statements. Learn Learn to understand what Javascript is and explain its use in web development. Overview JavaScript is the third of the major building blocks of a web page. Without it, we wouldn’t have the dynamic content and usability we expect from modern websites. We will now learn what it is (and isn’t) and how it is used, not only on the web but in all of its applications. What is JavaScript and why do we use it? JavaScript is a programming lan