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Interview Questions

JavaScript

Q1.What is JavaScript?

Q2. Is JavaScript compiled or interpreted?

Q3. What is the difference between Java and JavaScript?

Q4. Where is JavaScript used in real life?

Q5. What are variables in JavaScript?

Q6. Difference between var, let, and const

Q7. What are data types in JavaScript?

Q8. What is undefined and null?

Q9. What is an operator? Name types of operators.

Q10. What is a function?

Q11. What is an arrow function?

Q12. What is console.log()?

Q13. What is a conditional statement?

Q14. What is a loop?

Q15. Difference between == and ===

Q16. What is an array?

Q17. What is an object?

Q18. What is DOM?

Q19. What is an event in JavaScript?

Q20. What is alert(), prompt(), confirm()?

Q21. Explain execution context

Q22. What is call stack?

Q23. What is event loop?

Q24. How JavaScript handles async code?

Q25. Difference between call(), apply(), bind()

Q26. How this works in arrow function?

Q27. Explain async/await internally

Q28. What is garbage collection?

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ECMAScript

Q1.What is ECMAScript?

Q2. Why do we need ECMAScript?

Q3. What is ES6?

Q4. Name some features of ES6

Q5. What are template literals?

Q6. What is default parameter?

Q7. What is destructuring?

Q8. What is the spread operator?

Q9. What is import and export?

Q10. Difference between JavaScript and ECMAScript

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TypeScript

Q1. What is TypeScript?

Q2. Why do we use TypeScript?

Q3. Who developed TypeScript?

Q4. Is TypeScript a replacement for JavaScript?

Q5. What is type safety?

Q6. What are data types in TypeScript?

Q7. What is any type?

Q8. Difference between JS and TS

Q9. What is a TypeScript compiler?

Q10. Can browsers run TypeScript directly?

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JSON

Q1. What is JSON?

Q2. Full form of JSON

Q3. Why is JSON used?

Q4. Is JSON a JavaScript object?

Q5. Difference between JSON and object

Q6. JSON data types

Q7. What is JSON.stringify()?

Q8. What is JSON.parse()?

Q9. Where is JSON used in real life?

Q10. Is JSON language dependent?

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jQuery

Q1. What is jQuery?

Q2. Why use jQuery?

Q3. Is jQuery a library or framework?

Q4. How to include jQuery in a project?

Q5. Difference between JS and jQuery

Q6. What is DOM manipulation?

Q7. Is jQuery still used today?

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JavaScript – Medium

Q1. What is hoisting?

Q2. What is scope in JavaScript?

Q3. Difference between global and local scope

Q4. What is closure?

Q5. What is callback function?

Q6. What is higher-order function?

Q7. Difference between map(), filter(), reduce()

Q8. What is this keyword?

Q9. What is async and sync?

Q10. What is promise?

Q11. Promise states

Q12. What is setTimeout() and setInterval()?

Q13. What is shallow vs deep copy?

Q14. What is truthy and falsy values?

Q15. What is NaN?

Q16. What is type coercion?

Q17. What is strict mode?

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ECMAScript – Medium

Q1. Difference between ES5 and ES6

Q2. What are modules?

Q3. What is arrow function and its advantage?

Q4. What is for...of loop?

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JSON – Medium

Q1. How JSON is used in API?

Q2. JSON vs XML

Q3. Can JSON store functions?

Q4. How to validate JSON?

Q5. What is nested JSON?

Q6. How to access JSON data?

Q7. How to send JSON from frontend to backend?

Q8. What is REST API JSON response?

Q9. What is HTTP status code with JSON?

Q10. How JSON improves performance?

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