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
32
Arrays
3
Binary
1
Bits
1
Ciphers
23
Cryptography
51
Fundamentals
18
Games
3
Mathematics
1
Matrix
1
Object-oriented Programming
1
Performance
2
Permutations
1
Puzzles
12
Regular Expressions
1
Security
19
Strings
18
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
51 Kata Found
7 kyu
Decoding a message
3,055
samhstn
Puzzles
Algorithms
Cryptography
Security
Games
7 kyu
Mirroring cipher
856
user8580805
Strings
Cryptography
Security
Algorithms
6 kyu
Keyword Cipher
1,332
user8580805
Cryptography
Strings
Algorithms
5 kyu
Break the Caesar!
874
kingcobra
1 Issue Reported
Ciphers
Cryptography
Fundamentals
6 kyu
Scooby Doo Puzzle
316
adrian.eyre
2 Issues Reported
Puzzles
Cryptography
Algorithms
6 kyu
GA-DE-RY-PO-LU-KI cypher vol 3 - Missing key
613
dcieslak
1 Issue Reported
Fundamentals
Ciphers
Cryptography
5 kyu
GA-DE-RY-PO-LU-KI cypher vol 4 - Missing key madness
99
dcieslak
1 Issue Reported
Performance
Algorithms
Ciphers
Cryptography
5 kyu
Coding with Squared Strings
2,120
g964
1 Issue Reported
Fundamentals
Strings
Ciphers
Cryptography
6 kyu
Polybius square cipher - encode
1,340
tiriana
Cryptography
Ciphers
Algorithms
6 kyu
One down
1,206
WesleyYoung
1 Issue Reported
Strings
Algorithms
Cryptography
Puzzles
6 kyu
Rotation Cipher Cracker
927
NicholasSeward
1 Issue Reported
Ciphers
Cryptography
Algorithms
Security
Puzzles
6 kyu
Cubic Tap Code
585
KayleighWasTaken
Ciphers
Algorithms
Cryptography
7 kyu
Number encrypting: cypher
1,171
dgrcode
Fundamentals
Strings
Ciphers
Cryptography
7 kyu
GA-DE-RY-PO-LU-KI cypher
2,862
dcieslak
1 Issue Reported
Fundamentals
Ciphers
Cryptography
5 kyu
Simple Encryption #3 - Turn The Bits Around
270
user5036852
Cryptography
Security
Strings
Algorithms
Bits
6 kyu
Cryptography #1 - Viva Cesare
802
Dentzil
Fundamentals
Cryptography
Algorithms
6 kyu
Simple ROT13.5 cypher
716
user9247539
1 Issue Reported
Algorithms
Fundamentals
Ciphers
Cryptography
5 kyu
Simple Encryption #4 - Qwerty
796
user5036852
Cryptography
Security
Strings
Algorithms
5 kyu
Simple Encryption #2 - Index-Difference
883
user5036852
Fundamentals
Cryptography
Security
Strings
Arrays
Algorithms
6 kyu
GA-DE-RY-PO-LU-KI cypher vol 2
1,090
dcieslak
1 Issue Reported
Fundamentals
Ciphers
Cryptography
6 kyu
Digital cypher vol 3 - missing key
1,072
dcieslak
1 Issue Reported
Fundamentals
Ciphers
Cryptography
5 kyu
Second Variation on Caesar Cipher
2,007
g964
2 Issues Reported
Fundamentals
Ciphers
Cryptography
7 kyu
Digital cypher vol 2
3,358
dcieslak
1 Issue Reported
Fundamentals
Ciphers
Cryptography
6 kyu
Crack the PIN
3,058
zLuki
Algorithms
Cryptography
7 kyu
Digital cypher
8,348
dcieslak
Fundamentals
Ciphers
Cryptography
3 kyu
Rail Fence Cipher: Encoding and Decoding
9,119
darrentburgess
3 Issues Reported
Algorithms
Ciphers
Cryptography
Strings
Security
6 kyu
Simple Encryption #1 - Alternating Split
29,730
user5036852
3 Issues Reported
Cryptography
Algorithms
Strings
Arrays
Fundamentals
6 kyu
Encrypt this!
23,638
suic
Fundamentals
Strings
Regular Expressions
Arrays
Ciphers
Algorithms
Cryptography
Security
4 kyu
Hide a message in a deck of playing cards
282
Zwyx
Cryptography
Mathematics
Games
Permutations
Algorithms
6 kyu
Keyword Cipher Helper
955
jacobb
2 Issues Reported
Cryptography
Ciphers
Security
Object-oriented Programming
Strings
Loading...
Confirm
Collect:
undefined
Loading collection data...