This answer is available for premium subscribers.

JavaScript Interview Questions

Filter by Difficulty

Beginner

Intermediate

Expert

61.

What is memoization?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

62.

What is lazy loading?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

63.

What are some JavaScript performance best practices?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

64.

What is the difference between `call`, `apply`, and `bind`?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

65.

What is the module system in JavaScript?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

66.

What is tree shaking?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

67.

What is the difference between CommonJS and ES6 modules?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

68.

What is the Intersection Observer API?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

69.

What is `requestAnimationFrame`?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

70.

What is the Fetch API?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

71.

What is CORS?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

72.

What is the difference between localStorage, sessionStorage, and cookies?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

73.

What is a polyfill?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

74.

What is transpilation?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

75.

What is implicit type conversion?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

76.

What is the difference between `for...in` and `for...of`?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

77.

What is the comma operator?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

78.

What is short-circuit evaluation?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

79.

What is the nullish coalescing operator?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

80.

What is optional chaining?

intermediate Premium

Upgrade to Premium to see the answer

Upgrade to Premium

Showing 61 to 80 of 115 results

Premium Plan

$10.00 /monthly

Access all premium content - interview questions, and other learning resources
We regularly update our features and content, to ensure you get the most relevant and updated premium content.
1000 monthly credits
Cancel anytime

LearnThatStack

Interview Questions

Categories