Supple Soft Web Designer & Frontend Developer Interview Questions and Answers for Experienced

Complex it is not expected hard Interview

Q1. What is jsx and es6
Ans. 
JSX is a syntax extension for JavaScript that allows HTML to be written in React components. ES6 is a newer version of JavaScript with additional features.
• JSX allows developers to write HTML-like code within JavaScript files

• ES6 introduces new syntax and features like arrow functions, classes, and template literals

• JSX is transformed into regular JavaScript by tools like Babel before being rendered in the browser
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Q2. What is arrow function
Ans. 
Arrow functions are a concise way to write functions in JavaScript.
• Arrow functions do not have their own 'this' keyword.

• Arrow functions are more concise than traditional function expressions.

• Arrow functions do not have their own 'arguments' object.

• Arrow functions are best suited for non-method functions.

• Example: const add = (a, b) => a + b;
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Q3. What is lazy loading
Ans. 
Lazy loading is a technique used in web development to defer loading non-essential resources until they are needed.
• Lazy loading helps improve page load times by only loading resources when they are required.

• It is commonly used for images, videos, and other media files on websites.

• Lazy loading can be implemented using libraries like React.lazy() in React.js.
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Q4. Do you know how to code optimize
Ans. 
Yes, I have experience in coding optimization to improve performance and efficiency.
• Identifying and removing unnecessary code or dependencies

• Minifying and compressing code for faster loading times

• Using efficient algorithms and data structures

• Reducing the number of API calls by batching requests

• Implementing lazy loading for resources to improve page load times
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Q5. Do you know conditional rendering
Ans. 
Conditional rendering in React allows components to render different elements or components based on certain conditions.
• Use ternary operator to conditionally render elements

• Use logical && operator for conditional rendering

• Use if-else statements inside render method for more complex conditions
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Q1. Javascript basics
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Q2. Route guards and component lifecycle hooks
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Q1. What are the time queue, etc in API
Ans. 
Time queue in API refers to managing requests in a sequential order.
• Time queue ensures that API requests are processed in the order they are received.

• It helps in preventing overload on the server by limiting the number of concurrent requests.

• Examples include using promises or async/await in JavaScript to handle API calls sequentially.
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Q2. What is the meaning of preflight in API? (All questions are related to dev oops profile. I applied for Angular)
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Q1. Closure in Java script
Ans. 
Closure in JavaScript allows a function to access variables from its outer scope even after the function has finished executing.
• Closure is created when a function is defined within another function and the inner function references variables from the outer function.

• The inner function maintains a reference to the outer function's scope even after the outer function has finished executing.

• Closures are commonly used in ev...read more
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Q1. Coding and basics both asked
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Q1. Coding and basics both asked
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Array reverse
sorting arrray

Javascript, database concept

Q1. Family background CTC
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Q2. How many members?
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Q3. Fathers occupation?
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Q4. Native area details?
Ans. 
Native area details refer to the specific region or location where a particular group of people or species naturally reside or originate from.
• Native area details are important for understanding the natural habitat and distribution of a particular group.

• Examples include the native area details of certain plant species, animal species, or indigenous human populations.

• Studying native area details can help in conservation
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Q5. When you join early
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Q1. 1. Asked mostly related to last project that you have done
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Q1. 1. Javascript data types, 2.Typeof of null and undefined and difference between null and undefined. 3. Class component vs Functional Component. 4. Sum of all array items. 5. Print prime number 1 to 100.
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