JavaScript Interview Questions Compilation | Neulax (20 Qs) | 2025-08-26 04:12 PM

📘 Neulax - JavaScript Interview Prep
This video contains 20 JavaScript interview questions with answers.

📝 Questions & Answers:

Q1: What are web workers in JavaScript?
A1: Web workers run scripts in background threads for parallel execution.

Q2: What is the difference between Array.map() and Array.forEach()?
A2: map() returns a new array with transformed elements, forEach() executes a function on each element without returning.

Q3: What is BigInt in JavaScript?
A3: BigInt is a special numeric type that can represent integers of arbitrary size.

Q4: What is the difference between call, apply, and bind?
A4: call and apply invoke a function with a given this value, apply takes arguments as an array, bind returns a new function.

Q5: Explain event delegation in JavaScript.
A5: Event delegation is a technique of handling events at a higher level to improve efficiency.

Q6: What are default parameters in functions?
A6: Default parameters let you initialize function parameters with default values if no value is passed.

Q7: What is prototypal inheritance?
A7: Prototypal inheritance allows objects to inherit properties and methods from other objects.

Q8: What is BigInt in JavaScript?
A8: BigInt is a special numeric type that can represent integers of arbitrary size.

Q9: Explain 'this' keyword in JavaScript.
A9: 'this' refers to the object that is executing the current function.

Q10: What are JavaScript modules?
A10: Modules are reusable pieces of code that can be imported and exported in JavaScript.

Q11: What are higher-order functions?
A11: Higher-order functions are functions that take other functions as arguments or return them.

Q12: What are default parameters in functions?
A12: Default parameters let you initialize function parameters with default values if no value is passed.

Q13: What is event bubbling in JavaScript?
A13: Event bubbling is the propagation of an event from a child element up through its ancestors.

Q14: What are default parameters in functions?
A14: Default parameters let you initialize function parameters with default values if no value is passed.

Q15: Explain destructuring in JavaScript.
A15: Destructuring allows unpacking values from arrays or properties from objects into variables.

Q16: What is JavaScript?
A16: JavaScript is a high-level, interpreted programming language primarily used for web development.

Q17: What is the difference between Java and JavaScript?
A17: Java is a statically typed, compiled language, while JavaScript is dynamically typed and interpreted.

Q18: What is the difference between for...in and for...of?
A18: for...in iterates over object keys, for...of iterates over iterable values.

Q19: What is JavaScript?
A19: JavaScript is a high-level, interpreted programming language primarily used for web development.

Q20: Explain '==' vs '===' in JavaScript.
A20: '==' checks for value equality with type coercion, while '===' checks for both value and type equality.

🔔 Subscribe to Neulax for daily coding interview tips.

#JavaScript #Neulax

Видео JavaScript Interview Questions Compilation | Neulax (20 Qs) | 2025-08-26 04:12 PM канала Neulax