Microsecond Performance Monitoring with NodeJS

What is the difference between Controlled and Uncontrolled Components? Simple Answer: CONTROLLED: React state controls the input value. Example: <input value={name} onChange={...} /> UNCONTROLLED: DOM controls the input value. Example: <input ref={inputRef} defaultValue="..." /> Short Tip: Controlled = validation + real-time update Uncontrolled = file upload + simple form Like for more React answers 🔥 #ReactJS #InterviewQuestion #FullStackDeveloper

🔹 “Just a small UI change…” Developer: “I’ll update one component… should be quick.” After change → another component breaks Fix that → state updates stop working Fix state → API call behaves differently Fix API → UI re-renders unexpectedly And suddenly… a “small change” becomes a full debugging session 😄 💡 React is simple… until everything is connected #React #DeveloperLife #FrontendDevelopment #JavaScript #FullStackDeveloper

🚀 Day 2/30 – JavaScript Challenge LeetCode Problem: 2620 – Counter Today I learned about one of the most important concepts in JavaScript Closures. 🔹 Concept Explained: The inner function remembers the variable number even after the outer function has finished execution. This is called a closure. 🔹 Key Learnings: ✅ Closures help maintain state without global variables ✅ Useful in counters, ID generators, and real-world applications ✅ number++ returns the current value, then increments it #Leetcode #Day2 #JavaScript #Developers #Frontend

Deeply nested state updates in React are a silent productivity killer. If you've ever spent 10–15 minutes updating one tiny value inside a nested object you already know the pain. I used to mutate nested state directly — until it started affecting performance, debugging time, and even load time optimizations. Here’s a simple mindset shift that made my frontend code cleaner and easier to scale #React #FrontendDevelopment #ReactJS #JavaScript #useReducer #StateManagement #ReactHooks 

Most devs reach for a state management library too fast. Before you install Redux or Zustand, try this 👇🏾 // Manage related state together, not separately const [form, setForm] = useState({ name: '', email: '', password: '' }) const handleChange = (e) => { setForm(prev => ({ ...prev, [e.target.name]: e.target.value })) } One state object. One handler. Works for 90% of forms. Stop adding dependencies before you need them. Save this 🔖 #ReactJS #JavaScript #WebDevelopment #Fullstack #CodingTips

Props vs State ⚔️ 🔹 Props 📥 ✔ Passed from parent component ✔ Read-only (immutable) ✔ Used for communication 🔹 State 📦 ✔ Managed inside component ✔ Can be updated ✔ Controls dynamic behavior 🔹 Key Difference 🧠 📥 Props = External Data 📦 State = Internal Data 🔹 When to Use? 👉 Props → Send data between components 👉 State → Handle user interaction & changes #ReactJS #PropsVsState #FrontendDev #JavaScript

Day 6 — Find Second Largest Number in an Array (JavaScript) Problem Write a function to find the second largest number in an array. Example Input: [10, 5, 8, 20] Output: 10 Approach First find the largest number, then find the largest number smaller than it. Code function secondLargest(arr){ let largest = -Infinity let second = -Infinity for(let i = 0; i < arr.length; i++){ if(arr[i] > largest){ second = largest largest = arr[i] } else if(arr[i] > second && arr[i] !== largest){ second = arr[i] } } return second } console.log(secondLargest([10,5,8,20])) Alternative Approach function secondLargest(arr){ let sorted = [...new Set(arr)].sort((a,b) => b-a) return sorted[1] } What I Learned How to track two maximum values in a single loop. #javascript #frontenddeveloper #codingpractice #webdevelopment

Understanding useState vs useEffect in React ⚛️ A simple difference that made things much clearer for me: useState → used to store and update data useEffect → used to perform actions after data changes Once this clicked, React started making a lot more sense. Small concepts, big impact ⚡ #ReactJS #FrontendDevelopment #JavaScript #ReactHooks

⚛️ React Concept: useState Explained with Real Examples The "useState" hook allows you to add state management to functional components. It helps you store and update data that changes over time — like user input, counters, or UI state. Basic syntax: const [state, setState] = useState(initialValue); 🔹 "state" → current value 🔹 "setState" → function to update the value 📌 Common use cases: • Counter functionality • Form inputs • Toggle UI (show/hide) 📌 Best Practice: Always update state using the setter function and avoid directly mutating state. #reactjs #frontenddevelopment #javascript #webdevelopment #softwareengineering

How Node.js Works Internally? I recently wrote a blog explaining what actually happens inside Node.js when we run our code. It covers: - Core components (V8 Engine and libuv)   - Event loop and its phases   - Thread pool and CPU-intensive tasks   - I/O behavior with examples  If you're preparing for backend interviews or want to understand Node.js internals more clearly, this might help. Read here:   https://slugy.co/O7UHxj5 #NodeJS #JavaScript #BackendDevelopment #WebDevelopment