wtf
(
js
)
Problems
Daily
Games
Exam
Leaderboard
npx wtfjavascript
to play in your terminal
Problems
Summoning the challenge bank…
Problems
3 challenges in Loops
All topics
Algorithms & Recursion
Arrays
DOM Events
Destructuring
Event Loop & Memory
Floating Point
Interview Classics
Loops
Math
Objects
Patterns & Performance
Payments
Proxy & Reflect
Quiz: JS Questions
Scope & Hoisting
Security
Sorting Algorithms
Strict Mode
Testing Lifecycle
Type Coercion
TypeScript
URL & Web APIs
Unit Testing
WTF Quirks
Web Platform
YDKJS Book
Easy
Medium
Hard
|
Multiple choice
Coding
Drag & drop
Write the tests
Runtime machine
#
title
topic
type
difficulty
1
Labeled break out of nested loops
Loops
Coding
Hard
2
Make a plain object for…of-able
Loops
Coding
Hard
3
take(iterable, n) — lazy, infinite-safe
Loops
Coding
Hard