Parvej Khan’s Post

🚀 Elevate Your JavaScript Knowledge! 🚀 🔍 Dive into the Core of JavaScript with These Key Questions: 1.     What is JavaScript? 2.     What is hoisting in JavaScript? 3.     What is the difference between null and undefined? 4.     Is Javascript single-threaded? 5.     Explain the main component of the JavaScript Engine and how it works. 6.     Explain the event loop in JavaScript and how it helps in asynchronous programming. 7.     Difference between var, let, and const ? 8.     Different data types in Javascript? 9.     What is callback function and callback hell ? 10.  What is Promise and Promise chaining? 11.  What is async/await ? 12.  What is the difference between == and === operators ? 13.  Different ways to create an Object in Javascript ? 14.  What is rest and spread operator? 15.  What is a higher-order function? 💬 Ready to Amplify Your JavaScript Journey? Let's Connect! 🌐 #JavaScript #Tech #Programming #CareerGrowth #uideveloper #htmldeveloper #wfh #hiring #opentowork #immediatejoiner #frontdeveloper #reactjs #reactjsdeveloper #reactjsdevelopment #webdevelopment #htmldeveloper #uidevelopment #uideveloper #frontenddeveloper #openforopportunities #immediatejoiner #opportunities #wfh #workfromhome #html #css #javascript #javascriptdeveloper #webdeveloper #ReactJS #CustomHooks #CodeOptimization #FrontendDevelopment #WebDevelopment #CodingCommunity

𝗤.𝗪𝗵𝗮𝘁 𝗶𝘀 𝗮 𝗽𝗿𝗼𝘁𝗼𝘁𝘆𝗽𝗲 𝗰𝗵𝗮𝗶𝗻 𝗶𝗻 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁🔥?   Ans.-𝗣𝗿𝗼𝘁𝗼𝘁𝘆𝗽𝗲 𝗖𝗵𝗮𝗶𝗻 A 𝗽𝗿𝗼𝘁𝗼𝘁𝘆𝗽𝗲 𝗰𝗵𝗮𝗶𝗻 in JavaScript is a mechanism used for inheritance. Each object in JavaScript has an internal property called [[Prototype]], which points to another object, forming a chain. This allows an object to access properties and methods from its prototype. If a property or method is not found on the object itself, JavaScript looks up the prototype chain until it either finds the property or reaches the null value at the end of the chain. This structure underpins JavaScript's inheritance model and enables property sharing across objects🚀. For more interview questions follow : Ambika Kumar Kewat For more info follow 𝗔𝗸𝘀𝗵𝗮𝘆 𝗦𝗮𝗶𝗻𝗶 🚀 and NamasteDev.com. #javascript #reactjs #frontend #developement #engineering #reach #community #post #talk #learning #developer #engineeringcommunity #opensource #connections #jsfact #jobs #interview #question #hr #jobninterview #recruiter #webdevelopment #engagement #tech #software #techcommunity

Q . What is Currying in JavaScript🔥? Ans.- Currying in JavaScript is a technique where a function is transformed into a sequence of functions, each taking a single argument. Instead of taking all arguments at once, a curried function takes the first argument and returns a new function that takes the second argument, and so on. This continues until all arguments have been provided, at which point the original function is executed with all accumulated arguments. Currying is useful for creating reusable and configurable functions, and it helps in function composition, making code more modular and readable🚀. For more info follow Akshay Saini 🚀 and NamasteDev.com. #javascript #reactjs #frontend #developement #engineering #reach #community #post #talk #learning #developer #engineeringcommunity #opensource #connection #jsfact #jobs #interview #question #hr #learninpublic

Here are #interview questions for a #React developer position, along with brief answers: ➡ What is React? - A JavaScript library for building user interfaces. ➡ What is JSX? - A syntax extension for JavaScript that allows HTML-like code to be written in JavaScript files. ➡ What is the Virtual DOM? - A lightweight in-memory representation of the real DOM, used for efficient rendering. ➡ How do you handle state changes in React? - Using the setState() method or Hooks like useState(). ➡ What is a Higher-Order Component (HOC)? - A function that takes a component as an argument and returns a new component with additional props or functionality. ➡ What is React Hooks? - A way to use state and other React features without writing a class component. ➡ What is the difference between a controlled and uncontrolled component? - Controlled components have their state managed by React, while uncontrolled components manage their own state. ➡ How do you optimize the performance of a React application? - Using techniques like memoization, shouldComponentUpdate(), and React.memo(). ➡ What is React Context? - A way to share data between components without passing props down manually. ➡ How do you handle errors in React? - Using try-catch blocks, error boundaries, and the componentDidCatch() method. ➡ What is a ref in React? - A reference to a DOM node or a component instance. ➡ How do you use React Portals? - To render children into a different DOM container than the parent component. ➡ What is the difference between a class component and a functional component? - Class components use the class syntax and have a lifecycle, while functional components use a function and do not have a lifecycle. ➡ How do you handle side effects in React? - Using the useEffect() hook or the componentDidMount() method. ➡ What is React Router? - A popular library for client-side routing in React applications. Please comment down your interview questions. ✍ Credit : Gaurav Patel Follow: Alpna P. for more related content Keep sharing , keep learning ! #interviewquestions #javascript #html #reactdeveloper #react #reactjs #frontendinterview #frontenddeveloper #webdeveloper #follow #freshers #helpinghands #learningandgrowing

𝑰𝒔 𝑱𝒂𝒗𝒂𝑺𝒄𝒓𝒊𝒑𝒕 𝑺𝒊𝒏𝒈𝒍𝒆-𝑻𝒉𝒓𝒆𝒂𝒅𝒆𝒅? 𝑼𝒏𝒅𝒆𝒓𝒔𝒕𝒂𝒏𝒅𝒊𝒏𝒈 𝒕𝒉𝒆 𝑪𝒐𝒏𝒄𝒆𝒑𝒕: 𝐘𝐞𝐬! #𝐉𝐚𝐯𝐚𝐒𝐜𝐫𝐢𝐩𝐭 is inherently 𝐬𝐢𝐧𝐠𝐥𝐞-𝐭𝐡𝐫𝐞𝐚𝐝𝐞𝐝, meaning it has a single call stack that it uses to execute code. This design simplifies the execution model, making it easier for developers to write and debug code. However, it also means that JavaScript can handle only one task at a time, leading to potential issues with performance, especially in scenarios involving heavy computation or I/O operations. Despite its single-threaded nature, JavaScript can handle 𝐚𝐬𝐲𝐧𝐜𝐡𝐫𝐨𝐧𝐨𝐮𝐬 operations efficiently through its event loop. This mechanism allows JavaScript to offload tasks such as I/O operations to the browser's Web APIs, which run in the background. Once these tasks are completed, callbacks or promises are placed back in the event queue, enabling JavaScript to manage concurrency without multithreading. This approach allows for a responsive and efficient execution of asynchronous code while maintaining the simplicity of a single-threaded environment. Feel free to share your thoughts or experiences with JavaScript's single-threaded nature and its event loop mechanism. #JavaScript #WebDevelopment #AsynchronousProgramming #EventLoop #FrontendDevelopment #WebDesign #FrontendDevelopment #ResponsiveDesign #WebDevelopment #javascript #htmldeveloper #webdev #htmlcss #js #reactjs #frontend #html #css #reactjsdevelopment #hiring #opentowork #immediatejoiner #hiring #wfh #remote #joinus #uideveloper

Here are #interview questions for a #React developer position, along with brief answers: ➡ What is React? - A JavaScript library for building user interfaces. ➡ What is JSX? - A syntax extension for JavaScript that allows HTML-like code to be written in JavaScript files. ➡ What is the Virtual DOM? - A lightweight in-memory representation of the real DOM, used for efficient rendering. ➡ How do you handle state changes in React? - Using the setState() method or Hooks like useState(). ➡ What is a Higher-Order Component (HOC)? - A function that takes a component as an argument and returns a new component with additional props or functionality. ➡ What is React Hooks? - A way to use state and other React features without writing a class component. ➡ What is the difference between a controlled and uncontrolled component? - Controlled components have their state managed by React, while uncontrolled components manage their own state. ➡ How do you optimize the performance of a React application? - Using techniques like memoization, shouldComponentUpdate(), and React.memo(). ➡ What is React Context? - A way to share data between components without passing props down manually. ➡ How do you handle errors in React? - Using try-catch blocks, error boundaries, and the componentDidCatch() method. ➡ What is a ref in React? - A reference to a DOM node or a component instance. ➡ How do you use React Portals? - To render children into a different DOM container than the parent component. ➡ What is the difference between a class component and a functional component? - Class components use the class syntax and have a lifecycle, while functional components use a function and do not have a lifecycle. ➡ How do you handle side effects in React? - Using the useEffect() hook or the componentDidMount() method. ➡ What is React Router? - A popular library for client-side routing in React applications. Please comment down your interview questions. ✍ Follow: Vijay Kumar ▶️ for more related content Keep sharing , keep learning ! #interviewquestions #javascript #html #reactdeveloper #react #reactjs #frontendinterview #frontenddeveloper #webdeveloper #follow #freshers #helpinghands #learningandgrowing

Save this post and thank me later !! In most #frontend #interviews I will ask how #javascript works behind the scenes ? The most common answer is from Akshay Saini's video where they say execution context is created and later that will be removed from memory and new execution context will be created etc. Then I ask a simple question "Will #javascript be converted into ByteCode ? during execution ? " most don't answer that. I have got this image from #internet to explain how JS works behind the scenes. When JavaScript code runs, it's parsed into an Abstract Syntax Tree (AST), then interpreted into bytecode or machine code. A profiler monitors code execution, guiding the optimizing compiler (JIT) to generate highly optimized machine code using bytecode and profiling data. Incorrect assumptions may lead to "Deoptimize" phases. The JS Engine optimizes "hot functions" and utilizes techniques like inline caching. It manages the call stack to track executing functions and allocates memory using the memory heap. The garbage collector plays a vital role in reclaiming memory from unused objects. Can you comment the Interpreter used by Google chrome ? Follow me and I will help you to master frontend development: Vasanth Bhat #javascript #execution #interview #question

🚀 Excited to share some JavaScript knowledge with you all! Today, let's talk about "Short-circuiting in JavaScript" and how it can supercharge your coding efficiency! 🌟 Short-circuiting is a powerful feature in JavaScript that allows us to optimize our code by avoiding unnecessary evaluations. Here's a quick rundown: 🔍 What is Short-circuiting? Short-circuiting occurs when JavaScript logical operators (&& and ||) stop evaluating expressions as soon as they can determine the result without needing to evaluate the entire expression. 🚦 How does it work? With && (logical AND), if the first operand is false, JavaScript doesn't evaluate the second operand because the overall result will always be false. With || (logical OR), if the first operand is true, JavaScript doesn't evaluate the second operand because the overall result will always be true. 🔧 How can we make use of it? Conditional Rendering: Short-circuiting is handy in conditional rendering. For example, displaying content only if a certain condition is met without needing an if statement. Default Values: Set default values for variables or function parameters without needing a verbose if check. Avoiding Errors: Prevent potential errors by checking for null or undefined values before accessing properties or calling functions. Chaining Function Calls: Short-circuiting can streamline function calls, especially when dealing with optional functions. 💡 Top Tip: While short-circuiting can improve code efficiency, ensure it doesn't sacrifice readability. Code clarity should always be a priority! 🚀 Let's leverage short-circuiting to write cleaner, more efficient JavaScript code! 💻✨ #JavaScript #CodingTips #ShortCircuiting #ProgrammingEfficiency #softwaredeveloper #frontenddeveloper #JobSeeker #CareerOpportunity #NowHiring #JobSearch #Recruitment #CareerAdvancement #EmploymentOpportunity #JobOpening#Headhunters #HiringNow #CareerDevelopment #Recruiting #JobHunt #JobAlert #JobOpportunity #ProfessionalDevelopment

Q . What is Event Loop in JavaScript🔥? Ans.- The Event Loop in JavaScript is a mechanism that handles asynchronous operations, enabling non-blocking behavior. It continuously checks the call stack to see if it's empty, and if it is, it checks the event queue to see if there are any functions waiting to be executed. When the call stack is empty, the event loop pushes the first function from the event queue to the call stack, allowing it to be executed. This cycle allows JavaScript to efficiently manage multiple operations concurrently without blocking the execution of code, ensuring a responsive and smooth user experience🚀. For more info follow Akshay Saini 🚀 and NamasteDev.com. #javascript #reactjs #frontend #developement #engineering #reach #community #post #talk #learning #developer #engineeringcommunity #opensource #connection #jsfact #jobs #interview #question #hr #learninpublic