Roadmap

The most popular list: 75 curated problems covering the UI, JavaScript, and conceptual questions asked in interviews.

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/75

Solved

User Interface
Todo List
Easy
Star Widget
Easy
CalculatorPro
Easy
Feedback Form
Easy
AccordionPro
Medium
Select MenuPro
Medium
Bar Chart I
Medium
City Search I
Medium
Tic Tac Toe I
Medium
Country Capital GamePro
Medium
Transfer ListPro
Medium
Table of ContentsPro
Medium
Virtualized ListPro
Hard
Overlapping CirclesPro
Hard
Tree Navigation IPro
Hard
JavaScript Coding
Flatten Array
Easy
Shallow Equality
Easy
Identical DOM TreesPro
Medium
Group ByPro
Medium
JSON.stringify()Pro
Hard
Polyfill: map()
Easy
Event Emitter IIPro
Medium
Polyfill: filter()Pro
Easy
Polyfill: reduce()Pro
Easy
Deep MergePro
Medium
MemoizePro
Easy
promise.any()
Hard
promise.race()
Hard
promise.allSettled()
Hard
Debounce
Medium
Throttle
Medium
Deep Equality
Medium
Event Emitter
Medium
classnamesPro
Medium
sum(a)(b)(c).....(n)
Medium
asyncMapPro
Medium
promisifyPro
Medium
Polyfill: bind()
Medium
Polyfill: call()
Medium
Polyfill: apply()Pro
Medium
Deep CopyPro
Medium
multiAdd(1,2)(3)(4,5,6)()Pro
Medium
promise.all()
Hard
Custom PromisePro
Hard
Pub SubPro
Hard
LRU CachePro
Hard
Limit ConcurrencyPro
Hard
Retry Promise N TimesPro
Medium
Fetch with TimeoutPro
Medium
Traverse DOM TreePro
Medium
Conceptual
What is a closure in JavaScript?
Medium
What is the event loop in JavaScript?
Medium
var vs let vs const
Medium
Virtual DOM in React
Medium
this keyword in JavaScript
Medium
What is event delegation in JavaScript?
Medium
CSS selector specificity
Medium
How does the box model work in CSS?
Medium
CSR vs SSR
Medium
How to improve website performance?
Medium
What happens when you type a URL and hit enter?
Medium
Why not mutate state in React?
Medium
call() vs apply()
Medium
call() vs bind()
Medium
Rules of React hooks
Easy
== vs ===
Easy
key prop in React
Easy
What is hoisting in JavaScript?
Easy
async/await in JavaScript
Medium
What is prototypal inheritance?
Medium
Shallow copy vs deep copy
Medium
How does re-rendering work in React?
Medium
Debouncing vs throttling
Medium
Controlled vs uncontrolled components
Medium
How does the useEffect dependency array work?
Medium

Roadmap

User Interface

JavaScript Coding

Conceptual