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Algorithms 1 Computer Systems 1 Data Structures 8 JavaScript 80 Programming Languages 46 React Native 38
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Easy
26

What is the output of `console.log(2 + '2')`?

JavaScript
Medium
28

Explain closures in JavaScript

JavaScript
Easy
24

What is the difference between `null` and `undefined`?

JavaScript
Medium
28

What is hoisting in JavaScript?

JavaScript
Hard
26

Explain the event loop

JavaScript
Medium
26

What is the output of `0.1 + 0.2 === 0.3`?

JavaScript
Medium
29

What is a Promise?

JavaScript
Medium
30

Explain arrow function differences

JavaScript
Hard
27

What is the Temporal Dead Zone?

JavaScript
Medium
30

How does `this` work in JavaScript?

JavaScript
Hard
27

What is prototype inheritance?

JavaScript
Easy
35

What is the output of `typeof NaN`?

JavaScript
Medium
31

Explain event delegation

JavaScript
Medium
28

What is a pure function?

JavaScript
Easy
28

What is the difference between == and ===?

JavaScript
Hard
29

Explain CORS

JavaScript
Medium
26

What is a IIFE?

JavaScript
Medium
26

What is memoization?

JavaScript
Easy
30

Explain the spread operator

JavaScript
Hard
28

What is the call stack?

JavaScript