Speechify Senior Front end Developer Interview Questions and Answers

Q1. Output questions on JavaScript.(Array, hoisting, event)
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Q2. Questions on React and Redux
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Q1. Explain clousers with example
Ans. 
Closures are functions that retain access to their lexical scope, even when executed outside that scope.
• A closure is created when a function is defined inside another function.

• Example: function outer() { let x = 10; return function inner() { return x; }; }

• The inner function retains access to 'x' even after outer() has finished executing.

• Closures are often used for data encapsulation and maintaining state.
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Q2. What is hosting
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Hosting refers to the service that allows individuals and organizations to make their websites accessible on the internet.
• Web hosting provides server space for websites to store files and data.

• Types of hosting include shared, VPS, dedicated, and cloud hosting.

• Examples of hosting providers are Bluehost, SiteGround, and AWS.

• Hosting services often include domain registration, email accounts, and security features.
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Q3. What is event loop?
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The event loop is a core mechanism in JavaScript that manages asynchronous operations and executes code in a non-blocking manner.
• The event loop allows JavaScript to perform non-blocking I/O operations despite being single-threaded.

• It works with the call stack, callback queue, and Web APIs to handle asynchronous tasks.

• When an asynchronous operation completes, its callback is pushed to the callback queue.

• The event loop c...read more
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Q4. Explain promise? Difference between promise.all and promise.race
Ans. 
A promise is an object representing the eventual completion or failure of an asynchronous operation.
• A promise can be in one of three states: pending, fulfilled, or rejected.

• Promises allow for cleaner asynchronous code, avoiding callback hell.

• Example of a promise: const myPromise = new Promise((resolve, reject) => { /* async code */ });

• Promise.all takes an array of promises and resolves when all are fulfilled, or rej...read more
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Q5. Explain de lbouncing and throutling
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Debouncing and throttling are techniques to optimize performance by controlling the rate of function execution in JavaScript.
• Debouncing delays function execution until after a specified time has passed since the last event. Example: Search input that triggers a query only after the user stops typing for 300ms.

• Throttling ensures a function is executed at most once in a specified time interval. Example: A scroll event th...read more
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Q6. How to optimise your application in react
Ans. 
Optimizing a React application involves techniques to enhance performance and reduce load times.
• Use React.memo to prevent unnecessary re-renders of functional components.

• Implement code splitting with React.lazy and Suspense to load components only when needed.

• Utilize the useCallback and useMemo hooks to memoize functions and values, reducing recalculations.

• Optimize images and assets to decrease load times, using format...read more
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Q7. Explain component Life cycle
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Component lifecycle refers to the stages a component goes through from creation to removal in a front-end framework.
• 1. Mounting: The phase when a component is being created and inserted into the DOM. Example: constructor(), render().

• 2. Updating: Occurs when a component's state or props change. Example: shouldComponentUpdate(), componentDidUpdate().

• 3. Unmounting: The phase when a component is removed from the DOM. Examp...read more
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Q1. React JS and Java script
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Q1. Basic components communication
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Q2. Forms based questions
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First round is online assessment. Where we have multiple choice questions related to angular, css. Html, javascript

Q1. AOT. JIT compilers, Pipes, Services, Singleton component
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Q2. Have you developed website for physically challenged ppl, accessibility
Ans. 
Yes, I have experience developing websites for physically challenged individuals with a focus on accessibility.
• Implemented keyboard navigation for users with mobility impairments

• Utilized ARIA roles and attributes to improve screen reader compatibility

• Ensured color contrast and text size met WCAG standards

• Tested websites with assistive technologies like screen readers and voice recognition software
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Q1. How are you doing?
Ans. 
I'm doing well, excited about the opportunity to discuss my experience and skills in front-end development.
• I've been working on several projects that utilize React and Redux for state management.

• Recently, I completed a responsive web application that improved user engagement by 30%.

• I'm currently exploring new CSS frameworks to enhance my design skills.
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Q2. What do you do in your life?
Ans. 
I balance my professional life as a Senior Front End Developer with personal interests in technology, art, and community engagement.
• I work on building responsive web applications using React and Vue.js.

• I enjoy contributing to open-source projects, like improving documentation for libraries.

• In my free time, I explore UI/UX design principles to enhance my development skills.

• I volunteer at local tech meetups, sharing know...read more
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Q1. No problem with this
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Q2. The only way you could be
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Q1. Interviewer asked about depth in React Js and JavaScript. JavaScript questions - Hoisting, implementation of closure, difference between call, bind & apply. Logic implementation of suggestions list in sea...read more
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Q1. He asked about both technical and non technical related questions. Previous organisation works. What i have faced difficult y in previous organisation. And some scenario based questions.
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They asked JS basics and Promises, hoisting

Just asked about my work culture, as I worked in startup and product based company, they except me work in Agile and how u will adopt to MNC / service based company culture