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
Algorithms
8
Ciphers
3
Cryptography
15
Fundamentals
1
Games
2
Matrix
1
Performance
1
Puzzles
15
Security
9
Strings
2
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
15 Kata Found
7 kyu
Decoding a message
2,909
samhstn
Puzzles
Algorithms
Cryptography
Security
Games
6 kyu
Scooby Doo Puzzle
312
adrian.eyre
2 Issues Reported
Puzzles
Cryptography
Algorithms
6 kyu
One down
1,205
WesleyYoung
1 Issue Reported
Strings
Algorithms
Cryptography
Puzzles
6 kyu
Rotation Cipher Cracker
926
NicholasSeward
1 Issue Reported
Ciphers
Cryptography
Algorithms
Security
Puzzles
4 kyu
Tap Into Mr. Mxyzinjin's Toy Safe
84
Voile
Cryptography
Security
Puzzles
7 kyu
The Barksdale Code
2,751
milesflo
2 Issues Reported
Cryptography
Puzzles
3 kyu
Alphametics Solver
440
docgunthrop
Puzzles
Performance
Cryptography
Algorithms
Beta
Bob's Secret Cipher
13
B1ts
Status:
Testing & feedback needed
Estimated Rank:
6 kyu
Ciphers
Algorithms
Cryptography
Security
Strings
Puzzles
3 kyu
Tap Into Mr. Mxyzinjin's Safe
60
Voile
Cryptography
Security
Puzzles
Beta
Tap into Reivhax's robot
6
reivhax
Status:
Testing & feedback needed
Estimated Rank:
2 kyu
Security
Puzzles
Cryptography
Games
2 kyu
Tap into Mr. Mxyzinjin's Stream
112
Voile
Cryptography
Security
Puzzles
2 kyu
Tap Into Mr. Mxyzinjin's Brain
175
Voile
Cryptography
Security
Puzzles
3 kyu
Tap Into Mr. Mxyzinjin's Matrix
169
Voile
Cryptography
Security
Puzzles
Beta
Crypto Square
11
Lusina
1 Issue Reported
Status:
Waiting for issues to be resolved
Estimated Rank:
5 kyu
Cryptography
Puzzles
Algorithms
Fundamentals
6 kyu
Encryption and decryption--Matrix pair
51
myjinxin2015
1 Issue Reported
Puzzles
Algorithms
Matrix
Ciphers
Cryptography
Confirm
Collect:
undefined
Loading collection data...