How do you handle errors in JavaScript?

Handling errors in JavaScript is crucial for writing robust and reliable code. There are several techniques and mechanisms available to handle errors effectively. Let’s explore some of the common approaches: Try…Catch Statement: The try…catch statement allows you to catch and handle exceptions that occur within a specific block of code. The try block contains the … Read more

What are arrow functions in JavaScript?

Arrow functions, introduced in ECMAScript 6 (ES6), are a concise syntax for writing function expressions in JavaScript. They provide a more compact and expressive way to define functions compared to traditional function declarations or function expressions. Here’s the syntax for an arrow function: const functionName = (parameters) => {   // Function body   return value; }; … Read more

How can you check if a variable is an array in JavaScript?

In JavaScript, you can check if a variable is an array using several methods. Here are four commonly used approaches: Array.isArray(): The Array.isArray() method is the recommended and most reliable way to check if a variable is an array. It returns true if the provided value is an array; otherwise, it returns false. Example: const … Read more

Explain the concept of event bubbling and event capturing

Event bubbling and event capturing are two mechanisms used in the event propagation phase in the Document Object Model (DOM) in JavaScript. They determine the order in which event handlers are executed when an event occurs on a nested element within a parent element. Event Bubbling: Event bubbling is the default behavior in which an … Read more

What is the purpose of the this keyword in JavaScript?

In JavaScript, the this keyword is a special keyword that refers to the current execution context or the object that the function is bound to. Its value is determined dynamically based on how a function is invoked, and it provides access to the context-specific data and properties. The behavior of this can vary depending on … Read more

Explain the concept of debouncing and throttling in JavaScript.

Debouncing and throttling are techniques used in JavaScript to control the frequency of executing a particular function in response to an event. They help optimize performance and improve user experience in scenarios where frequent or rapid event triggering can lead to unnecessary function executions. Debouncing: Debouncing is the process of delaying the execution of a … Read more

Explain the concept of prototypal inheritance in JavaScript.

Prototypal inheritance is a fundamental concept in JavaScript that allows objects to inherit properties and methods from other objects. It is a key feature of JavaScript’s object-oriented programming paradigm. In JavaScript, every object has an internal property called [[Prototype]] (also referred to as “dunder proto” or “proto”). This [[Prototype]] property references another object, which is … Read more

What are JavaScript promises? How do they work?

JavaScript promises are objects used for handling asynchronous operations. They represent the eventual completion (or failure) of an asynchronous operation and allow you to write more readable and maintainable asynchronous code. Promises work based on the concept of “callbacks.” Traditionally, callbacks were used to handle asynchronous operations, but they can result in callback hell and … Read more