Convert Array to Object in JavaScript

🚨 JavaScript Interview Question What will be the output? 🤔 function greet(name) { if (name === undefined) { console.log("Hello, guest!"); } else { console.log("Hello, " + name); } } greet(); greet("Amrutha"); greet("Vineeth", "How are you?"); Looks simple… but there’s a twist 👀 👉 What will be the output? 👉 Why does the last call behave differently? Bonus: How does JavaScript handle extra arguments? 🔥 #JavaScript #FrontendInterview #WebDevelopment #CodingInterview #ProductBasedCompany

💻 JavaScript Interview Question Write a function that takes a string input, and returns the first character that is not repeated anywhere in the string. For example, if given the input "stress", the function should return 't', since the letter t only occurs once in the string, and occurs first in the string. If a string contains only repeating characters, return an empty string (""); function firstNonRepeatingLetter(s) { let mySet = new Set(); //stress for(let c of s) { if(mySet.has(c.toLowerCase())) { mySet.delete(c.toLowerCase()); } else if(mySet.has(c.toUpperCase())) { mySet.delete(c.toUpperCase()); } else { mySet.add(c); } } const setAsArray = Array.from(mySet); if(setAsArray.length == 0) return (""); return (setAsArray[0]); } #javaScript #CodingInterview #WebDevelopment #Frontend #React

JavaScript Interview Question I Faced Recently 💻 One of the questions I forgot to share earlier: Problem: Convert the array "["a","1","b","2","c","3"]" into the object "{ a: 1, b: 2, c: 3 }" My Approach: const arr = ["a","1","b","2","c","3"]; const result = {}; for (let i = 0; i < arr.length; i += 2) { result[arr[i]] = arr[i + 1]; } console.log(result); Idea: The array contains alternating key–value pairs. So we iterate through the array by 2 steps and assign: - "arr[i]" → key - "arr[i+1]" → value Simple but a good way to test JavaScript fundamentals and array manipulation. Have you seen similar questions in interviews? 🤔 #JavaScript #FrontendDevelopment #CodingInterview #WebDevelopment #Learning

⚡ JavaScript Interview Question Day 1: What is the difference between: null vs undefined ? Quick explanation 👇 undefined ------------- • Variable declared but not assigned Example: let a; console.log(a) // undefined null ------ • Intentional absence of value Example: let user = null 💡 Tip: undefined → system assigned null → developer assigned #javascript #frontend #codinginterview #programming #interview #react #angular #performance #UI

🚨 JavaScript Interview Question 🚨 99% of developers get this wrong on the first try 😵 What will be the output? 🤔 console.log("5" - 3); console.log("5" + 3); A) 2 and 8 B) 2 and "53" C) "2" and "53" D) NaN 👇 Drop your answer in the comments before checking! 💬 Be honest — did you get it right? 👇 Comment your answer (A/B/C/D) 🔁 Save this for interviews ❤️ Like if you learned something new 👥 Follow for daily JavaScript questions #javascript #webdevelopment #frontend #coding #interviewquestions #developers #100DaysOfCode #learncoding

🚨 JavaScript Interview Question (Advanced 🔥) What will be the output? 🤔 function Person(name) { this.name = name; } Person.prototype.getName = function () { return this.name; }; const p1 = new Person("Suman"); const p2 = { name: "Rahul", }; console.log(p1.getName()); console.log(p1.getName.call(p2)); Looks simple… but there’s a twist 👀 👉 What will be the output? 👉 Why does the second call behave differently? Bonus: What concept is being tested here? 🔥 #JavaScript #FrontendInterview #Prototypes #ThisKeyword #WebDevelopment

#JavaScript Interview Series: Do you REALLY know how Hoisting works? Ever wondered why you can call a function before it's defined, but let and const throw an error? That's Hoisting in action! 🧐 In JavaScript, variable and function declarations are moved to the top of their scope during the compilation phase. But there's a catch... ✅ Functions: Fully hoisted. You can call them anytime. ✅ var: Hoisted but initialized as undefined. ❌ let & const: Hoisted but in the "Temporal Dead Zone" (TDZ). You can't touch them until the line of declaration. Check out the example below: console.log(a); // undefined var a = 5; greet(); // "Hello!" function greet() { console.log("Hello!"); } // console.log(b); // ReferenceError! let b = 10; Mastering these core concepts is the difference between a Junior and a Senior developer. 💻✨ Ready to ace your next JS interview? I've curated a list of the most important JavaScript questions with deep dives and Hinglish explanations! 👇 🔗 Read more here:  https://lnkd.in/ghMhTcws #JavaScript #WebDevelopment #InterviewPrep #Coding #Programming #HashWebix #Frontend #ReactJS #NodeJS #TechInsights

JavaScript Interview Question (Confusing but Important 🤯) What will be the output? console.log([] == []); console.log([] === []); console.log({} == {}); console.log({} === {}); 👉 Answer: All will be false Why? Arrays and objects in JavaScript are stored in memory by reference, not by value. Each [] or {} creates a new object with a different memory address, and JavaScript compares references — not structure or content. Same shape ≠ same reference 📌 This is one of the most common JavaScript interview traps. #JavaScript #InterviewQuestions #WebDevelopment #Frontend #Backend #CodingTips

💻 JavaScript Interview Question You will be given a string and two indexes (a and b). Your task is to reverse the portion of that string between those two indices inclusive. str = "javascript", a = 1, b = 5 --> "jcsavaript" East right ? But rather than traversing the string and using 2-pointer technique, you have to use the inbuilt functions of javascript. This tests your understanding of the language and how it works internally. function solve(st, a, b){ return st.slice(0,a)+(st.slice(a, b+1).split("").reverse().join(""))+st.slice(b+1); } Feel free to discuss more in comments 🖐 #javaScript #CodingInterview #WebDevelopment #Frontend #React

5 Advanced JavaScript Interview Questions Every Developer Should Know 🚀 JavaScript interviews often go beyond the basics. Understanding core concepts helps you write cleaner, scalable, and more efficient code. Here are 5 important JavaScript questions every developer should know: 1️⃣ What are Closures in JavaScript? A closure occurs when a function remembers variables from its outer scope, even after the outer function has finished executing. 2️⃣ What is the Event Loop? The Event Loop allows JavaScript to handle asynchronous operations (API calls, timers, promises) by managing the call stack and callback queue. 3️⃣ Difference between == and ===? • == → Compares values after type conversion • === → Strict comparison (value + type) 4️⃣ What is Hoisting? Hoisting means variable and function declarations are moved to the top of their scope during the compilation phase. 5️⃣ What are Promises? Promises are used to handle asynchronous operations and have three states: Pending → Fulfilled → Rejected 💡 Mastering these concepts helps developers build scalable and reliable applications. #JavaScript #WebDevelopment #Frontend #Programming #CodingInterview #Developers