Must-Know JavaScript Interview Questions for Frontend Developers

10

What is closure in JavaScript and how do you use it?

1

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Explain the event loop in JavaScript and how it relates to asynchronous programming.

2

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3

What is the difference between null and undefined in JavaScript?

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4

How does prototypal inheritance work in JavaScript?

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5

What are the differences between == and === in JavaScript?

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6

Explain the concept of hoisting in JavaScript.

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7

How do you handle errors in JavaScript? Explain the try, catch, and finally blocks.

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8

Describe the differences between var, let, and const.

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9

Explain the concept of event delegation in JavaScript.

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10

What are promises in JavaScript and how do they differ from callbacks?

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