JavaScript Object Comparison: Reference vs Value

🚨 JavaScript Async Interview Question What will be the output? async function test() { console.log("1"); setTimeout(() => { console.log("2"); }, 0); await Promise.resolve(); console.log("3"); } console.log("4"); test(); console.log("5"); This question tests understanding of: • Call Stack • Async/Await behavior • Microtask queue (Promises) • Macrotask queue (setTimeout) • JavaScript Event Loop Many developers get the order wrong the first time. What do you think the output will be? #JavaScript #FrontendInterview #AsyncJavaScript #EventLoop #ReactJS #FrontendDeveloper #ProductBasedCompany

🚨 JavaScript Interview Question What will be the output? function outer() { let count = 0; return function inner() { count++; console.log(count); }; } const fn1 = outer(); const fn2 = outer(); fn1(); fn1(); fn2(); fn2(); This question tests your understanding of: • Closures • Lexical scope • How JavaScript handles function instances Even though both functions come from the same outer() function, they behave independently. What do you think the output will be? #JavaScript #FrontendInterview #Closures #ReactJS #FrontendDeveloper #ProductBasedCompany

🚨 JavaScript Interview Question What will be the output? const obj = { name: "Frontend", greet: function () { console.log(this.name); } }; const greet = obj.greet; greet(); greet.call(obj); greet.bind(obj)(); This question tests understanding of: • this binding • call() • bind() • Function invocation context Many developers expect all three calls to behave the same. But JavaScript handles this differently depending on how the function is invoked. What do you think the output will be? #JavaScript #FrontendInterview #ReactJS #FrontendDeveloper #JavaScriptConcepts #ProductBasedCompany

🚨 JavaScript Interview Question What will be the output? const obj = { name: "Frontend", regularFunc: function () { console.log(this.name); }, arrowFunc: () => { console.log(this.name); } }; obj.regularFunc(); obj.arrowFunc(); Both functions are inside the same object. But the output is different. This question tests understanding of: • this binding • Arrow functions vs regular functions • Execution context in JavaScript Many developers assume both will print the same value. What do you think the output will be? #JavaScript #FrontendInterview #ReactJS #FrontendDeveloper #JavaScriptConcepts #ProductBasedCompany

🚨 JavaScript Interview Question What will be the output? const obj = { name: "Frontend", regularFunc: function () { console.log(this.name); }, arrowFunc: () => { console.log(this.name); } }; obj.regularFunc(); obj.arrowFunc(); Both functions are inside the same object. But the output is different. This question tests understanding of: • this binding • Arrow functions vs regular functions • Execution context in JavaScript Many developers assume both will print the same value. What do you think the output will be? #JavaScript #FrontendInterview #ReactJS #FrontendDeveloper #JavaScriptConcepts #ProductBasedCompany

🔥 Tricky JavaScript Async/Await Interview Question 🔥 What will be the output of this code? 👇 async function test() { try { console.log("1"); await Promise.reject("Error"); console.log("2"); } catch (e) { console.log("3"); } finally { console.log("4"); } } test(); console.log("5"); 💬 Drop your answer before checking 👇 #JavaScript #FrontendDevelopment #AsyncAwait #Promises #WebDevelopment #InterviewPreparation #ReactJS #CodingInterview #EventLoop #JavaScriptTips #SoftwareEngineering

JavaScript Interview Question What will be the output? function outer() { let count = 0; return function inner() { count++; console.log(count); }; } const fn1 = outer(); const fn2 = outer(); fn1(); fn1(); fn2(); fn2(); This question tests your understanding of: • Closures • Lexical scope • How JavaScript handles function instances Even though both functions come from the same outer() function, they behave independently. What do you think the output will be? #JavaScript #FrontendInterview #Closures #ReactJS

🚨 JavaScript Async Interview Question What will be the output? console.log("Start"); setTimeout(() => { console.log("Timeout 1"); }, 0); Promise.resolve() .then(() => { console.log("Promise 1"); }) .then(() => { console.log("Promise 2"); }); setTimeout(() => { console.log("Timeout 2"); }, 0); console.log("End"); Looks simple… But many developers get the order wrong. Because JavaScript doesn’t execute async code the way we intuitively expect. This question tests your understanding of: • Call Stack • Microtask Queue • Macrotask Queue • JavaScript Event Loop What do you think the output will be? #JavaScript #FrontendInterview #EventLoop #ReactJS #FrontendDeveloper #ProductBasedCompany

🚀 **JavaScript Interview Question** What will be the output of this code? ```js const obj = { a: { b: 0 } }; const v1 = obj?.a?.b || 42; const v2 = obj?.a?.b ?? 42; console.log(v1, v2); ``` 🤔 **Think before you scroll...** --- #JavaScript #Frontend #WebDevelopment #CodingInterview #ReactJS

💻 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