Null vs Undefined in JavaScript

JavaScript Interview Series – Day 1 Let’s understand What is Event Loop? JavaScript uses the Event Loop to handle asynchronous operations by coordinating: • Call Stack • Web APIs • Callback Queue When the Call Stack is empty, the Event Loop moves tasks from the Callback Queue to the Stack. #JavaScript #NodeJS #WebDevelopment #Programming #SoftwareEngineering #InterviewPreparation

JavaScript Interview Series – Day 12 Let’s understand What is this in JavaScript. The value of this depends on how a function is called, not where it is defined. 🔎 Key Point Normal functions → this depends on caller Arrow functions → this is inherited from outer scope #JavaScript #NodeJS #WebDevelopment #Programming #SoftwareEngineering #InterviewPreparation

JavaScript Interview Series – Day 4 Let’s understand Promise vs Async/Await in JavaScript. Both are used to handle asynchronous operations, but they differ in syntax and readability. Promise uses .then() and .catch() chaining, while async/await provides a cleaner, synchronous-like structure. #JavaScript #NodeJS #WebDevelopment #Programming #SoftwareEngineering #InterviewPreparation

JavaScript Interview Series – Day 14 Let’s understand What is Prototype in JavaScript. In JavaScript, every object has a hidden property called [[Prototype]] which links to another object. This is called the prototype chain. It allows objects to inherit properties and methods from other objects. 🔎 Key Concept • Objects inherit from other objects • Prototype enables code reuse • JavaScript uses prototype-based inheritance #JavaScript #NodeJS #WebDevelopment #Programming #SoftwareEngineering #InterviewPreparation

JavaScript Interview Series – Day 15 Let’s understand What is == vs === in JavaScript. Both are used for comparison, but they behave differently. 🔎 Key Difference • == → compares after type conversion • === → compares value + type (strict) #JavaScript #NodeJS #WebDevelopment #Programming #SoftwareEngineering #InterviewPreparation

JavaScript Interview Series – Day 7 Let’s understand What is Error Handling in Promises? In JavaScript, errors in promises can be handled using .catch() or try...catch with async/await. This helps prevent application crashes and makes debugging easier. #JavaScript #NodeJS #WebDevelopment #Programming #SoftwareEngineering #InterviewPreparation

JavaScript Interview Series – Day 8 Let’s understand How setTimeout works internally in JavaScript. Even though setTimeout looks simple, it works using the Event Loop mechanism. When setTimeout is called, it is handled by Web APIs, and after the timer completes, the callback is moved to the Callback Queue. The Event Loop pushes it to the Call Stack only when it becomes empty. #JavaScript #NodeJS #WebDevelopment #Programming #SoftwareEngineering #InterviewPreparation

JavaScript Interview Series – Day 3 Let’s understand What is Async/Await in JavaScript. async/await is a modern way to handle asynchronous operations. It is built on top of promises and makes async code look like synchronous code. This improves readability and avoids complex .then() chaining. #JavaScript #NodeJS #WebDevelopment #Programming #SoftwareEngineering #InterviewPreparation

JavaScript Interview Series – Day 13 Let’s understand call(), apply(), and bind() in JavaScript. These methods are used to control the value of this inside a function. 🔎 Key Difference • call() → arguments passed one by one • apply() → arguments passed as array • bind() → returns a new function #JavaScript #NodeJS #WebDevelopment #Programming #SoftwareEngineering #InterviewPreparation

JavaScript Interview Series – Day 11 Let’s understand What is Hoisting in JavaScript. Hoisting is JavaScript’s default behavior of moving variable and function declarations to the top of their scope during the compilation phase. However, only declarations are hoisted not initializations. #JavaScript #NodeJS #WebDevelopment #Programming #SoftwareEngineering #InterviewPreparation