JavaScript Event Loop Explained with Code Example

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

learned optional chaining in react today. making: IPL project 🏏 issue faced: accessing nested objects like "object.object.object" fix/learned: optional chaining ("?.") to avoid crashes & undefined errors small thing, big sanity save. #reactjs #webdev #buildinpublic #javascript

Day 1 — Reverse a String (JavaScript) Problem Write a function that reverses a given string. Example Input: "hello" Output: "olleh" Approach Start from the last character of the string and iterate backwards. Keep adding each character to a new string until the loop finishes. Code function reverseString(str){ let reversed = "" for(let i = str.length - 1; i >= 0; i--){ reversed += str[i] } return reversed } console.log(reverseString("hello")) What I Learned Basic string traversal and how iteration works from the end of a string. #javascript #frontenddeveloper #codingpractice #dsa

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

#js #4 **typeof operator** The typeof keyword in JavaScript is an operator that returns a string describing the data type of a value or variable. It’s widely used to check types at runtime, especially in dynamic code. Example: const firstName= 'Rohit' console.log(typeof(firstName)) //string const age = 20; console.log(typeof(age)) //number const isEligible = true console.log(typeof(isEligible)) //boolean #Javascript #ObjectOrientedProgramming #SoftwareDevelopment

What will be the output of the following JavaScript code? console.log([] + []); console.log([] + {}); console.log({} + []); 💬 Drop your answers below without running the code! #JavaScript #Developers

JS Pop Quiz: Did we just overwrite the Admin?! Let’s see who really understands JavaScript memory allocation! 👨💻👩💻 Look at the code snippet from @codewithsarir. We have a user1 object. We assign it to user2, and then change user2's role to 'Guest'. Question: What does console.log(user1.role) actually print? A) 'Admin' (Because we only changed user2) B) 'Guest' (Because they share the same reference) C) undefined D) It throws a TypeError Hint: Think about how JavaScript handles Objects versus Primitive types like strings. Does = make a copy, or just point to the same address? 🤔 Drop your guess in the comments before you test it in your IDE! 👇 Hashtags: #JavaScript #CodingQuiz #WebDesign #ProgrammerLife #Developers #LearnToCode #JS #Frontend #creators #codinglife #programmer

🚀 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

I once fixed a performance issue… Didn’t change logic. Didn’t add caching. Just replaced a loop with Promise.all() Speed went 📈 Sometimes the problem isn’t scale… it’s how you write async code. #SoftwareEngineering #NodeJS #JavaScript #Performance #DevTips

🚀 💡 JavaScript Tricky Question Explanation const arr = [4, 10, 2, 8]; const result = arr.find(num => num > 5) + arr.findIndex(num => num > 5); console.log(result); 👉 Output: 11 👉 Explanation: * find() returns the first value > 5 → `10` * findIndex() returns its index → `1` * Final result → `10 + 1 = 11` ⚡ Both stop at the **first match** #JavaScript #WebDevelopment #Frontend #CodingInterview #JSConcepts