Kata Library: JavaScript Practice
Sign Up
Time to claim your honor
Training
Practice
Complete challenging
Kata
to earn honor and ranks. Re-train to hone technique
Freestyle Sparring
Take turns remixing and refactoring others code through
Kumite
Community
Leaderboards
Achieve honor and move up the global leaderboards
Chat
Join our
Discord
server and chat with your fellow code warriors
Discussions
View our
Github Discussions
board to discuss general Codewars topics
About
Docs
Learn about all of the different aspects of Codewars
Blog
Read the latest news from Codewars and the community
Log In
Sign Up
Library
Collections
Newest
Oldest
Popularity
Positive Feedback
Most Completed
Least Completed
Hardest
Easiest
Name
Relevance
Low Satisfaction
All
My Languages
Agda (Beta)
BF (Beta)
C
CFML (Beta)
Clojure
COBOL (Beta)
CoffeeScript
CommonLisp (Beta)
Coq
C++
Crystal
C#
D (Beta)
Dart
Elixir
Elm (Beta)
Erlang (Beta)
Factor (Beta)
Forth (Beta)
Fortran (Beta)
F#
Go
Groovy
Haskell
Haxe (Beta)
Idris (Beta)
Java
JavaScript
Julia (Beta)
Kotlin
λ Calculus (Beta)
Lean
Lua
NASM
Nim (Beta)
Objective-C (Beta)
OCaml (Beta)
Pascal (Beta)
Perl (Beta)
PHP
PowerShell (Beta)
Prolog (Beta)
PureScript (Beta)
Python
R (Beta)
Racket
Raku (Beta)
Reason (Beta)
RISC-V (Beta)
Ruby
Rust
Scala
Shell
Solidity (Beta)
SQL
Swift
TypeScript
VB (Beta)
Approved & Beta
Approved
Beta
All
Kata I have not trained on
Kata I have not completed
Kata I have completed
8 kyu
easiest
7 kyu
6 kyu
5 kyu
4 kyu
3 kyu
2 kyu
1 kyu
hardest
ASCII Art
1
Algorithms
39
Angular
1
Arrays
11
Artificial Intelligence
1
Ciphers
8
Cryptography
1
Data Structures
1
Debugging
8
Decorator
1
Design Patterns
2
Fundamentals
66
Game Solvers
1
Games
12
Geometry
2
Language Features
4
Linear Algebra
1
Logic
7
Mathematics
7
Metaprogramming
2
Object-oriented Programming
128
Parsing
2
Performance
2
Puzzles
10
Recursion
2
Refactoring
5
Reflection
1
Regular Expressions
4
Security
7
Simulation
1
Singleton
1
Sorting
4
State Machines
1
Strings
11
Trees
1
Tutorials
2
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
128 Kata Found
6 kyu
The Enigma Machine - Part 1: The Plugboard
2,828
ChristianECooper
5 Issues Reported
Fundamentals
Algorithms
Object-oriented Programming
6 kyu
Simple Substitution Cipher Helper
3,732
jacobb
Ciphers
Security
Object-oriented Programming
Strings
Algorithms
7 kyu
Fun with ES6 Classes #3 - Cuboids, Cubes and Getters
6,553
donaldsebleung
Fundamentals
Object-oriented Programming
7 kyu
Make Class
2,501
Jomopipi
1 Issue Reported
Object-oriented Programming
Algorithms
4 kyu
Vigenère Cipher Helper
8,930
jacobb
4 Issues Reported
Algorithms
Ciphers
Security
Object-oriented Programming
Strings
7 kyu
Doggy Daycare
831
Shadows666
Fundamentals
Object-oriented Programming
Data Structures
8 kyu
Classy Extentions
12,627
matt c
Fundamentals
Object-oriented Programming
6 kyu
Smart Traffic Lights
1,159
user2514386
Fundamentals
Object-oriented Programming
7 kyu
Refactored Greeting
12,057
jhoffner
2 Issues Reported
Object-oriented Programming
Refactoring
6 kyu
Array Helpers
23,834
BattleRattle
1 Issue Reported
Arrays
Fundamentals
Object-oriented Programming
6 kyu
Custom Array Filters
2,737
Mackay
2 Issues Reported
Arrays
Fundamentals
Object-oriented Programming
7 kyu
Fun with ES6 Classes #4 - Cubes and Setters
5,922
donaldsebleung
1 Issue Reported
Fundamentals
Object-oriented Programming
4 kyu
Ranking Poker Hands
3,575
FrankK
4 Issues Reported
Games
Algorithms
Object-oriented Programming
5 kyu
Caesar Cipher Helper
5,210
eugene-bulkin
4 Issues Reported
Ciphers
Object-oriented Programming
Strings
Algorithms
4 kyu
Validate Sudoku with size `NxN`
9,827
cbmono
13 Issues Reported
Arrays
Puzzles
Algorithms
Object-oriented Programming
6 kyu
Urban Dictionary
2,210
joh_pot
2 Issues Reported
Algorithms
Object-oriented Programming
7 kyu
JavaScript class-like objects
11,369
jhoffner
2 Issues Reported
Object-oriented Programming
Fundamentals
7 kyu
Fun with ES6 Classes #2 - Animals and Inheritance
14,120
donaldsebleung
Fundamentals
Object-oriented Programming
7 kyu
Singleton Pattern
8,206
hculap
1 Issue Reported
Singleton
Object-oriented Programming
Fundamentals
7 kyu
SantaClausable Interface
14,458
BattleRattle
4 Issues Reported
Object-oriented Programming
7 kyu
Building blocks
13,276
NaMe613
1 Issue Reported
Object-oriented Programming
Fundamentals
8 kyu
Color Ghost
20,466
ogryzek
8 Issues Reported
Object-oriented Programming
Fundamentals
7 kyu
Bug fix: Is this component visible?
105
dfhwze
Refactoring
Trees
Object-oriented Programming
8 kyu
Playing with cubes II
8,900
Jotha
Fundamentals
Object-oriented Programming
5 kyu
Program a Calculator #2 - 3D Vectors
322
donaldsebleung
3 Issues Reported
Mathematics
Object-oriented Programming
Algorithms
6 kyu
Program a Calculator #1 - Points in 3D Space
369
donaldsebleung
Mathematics
Algorithms
Object-oriented Programming
5 kyu
Art of Potion Crafting
21
dfhwze
Fundamentals
Object-oriented Programming
Simulation
7 kyu
Competitive eating scoreboard
1,515
sofiapoh
Object-oriented Programming
Fundamentals
6 kyu
Pong! [Basics]
1,386
KDaryl
2 Issues Reported
Fundamentals
Games
Algorithms
Object-oriented Programming
8 kyu
Classy Classes
18,233
matt c
Fundamentals
Object-oriented Programming
Loading...
Confirm
Collect:
undefined
Loading collection data...