Callback vs Promise in JavaScript Explained

JavaScript Interview Series – Day 19 Let’s understand Debouncing vs Throttling in JavaScript. Both are used to control how often a function executes, especially in events like scroll, resize, and search input. 🔎 Key Difference • Debounce → waits for pause • Throttle → limits execution rate #JavaScript #NodeJS #WebDevelopment #FrontendDevelopment #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 6 Let’s understand What is Promise Chaining? Promise chaining allows us to execute multiple asynchronous operations in sequence using .then(). Instead of nesting callbacks, we can chain promises, making the code cleaner and more readable. #JavaScript #NodeJS #WebDevelopment #Programming #SoftwareEngineering #InterviewPreparation

JavaScript Interview Series – Day 5 Let’s understand What is Callback Hell? Callback hell happens when multiple callbacks are nested inside each other, making the code hard to read and maintain. It usually occurs in asynchronous operations when callbacks depend on previous results. #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 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 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 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 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

JavaScript Interview Series – Day 17 Let’s understand Event Bubbling vs Event Capturing in JavaScript. When an event occurs on an element, it travels through the DOM in two phases: 👉 Capturing Phase (Top → Down) 👉 Bubbling Phase (Bottom → Up) #JavaScript #NodeJS #WebDevelopment #FrontendDevelopment #Programming #SoftwareEngineering #InterviewPreparation