Kata Library
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
18
Arrays
7
Ciphers
1
Cryptography
1
Data Structures
4
Functional Programming
4
Fundamentals
18
Logic
1
Mathematics
2
Regular Expressions
18
Restricted
1
Security
1
Strings
18
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
18 Kata Found
7 kyu
Coding Meetup #4 - Higher-Order Functions Series - Find the first Python developer
10,085
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
Regular Expressions
7 kyu
Coding Meetup #2 - Higher-Order Functions Series - Greet developers
12,613
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
7 kyu
Coding Meetup #1 - Higher-Order Functions Series - Count the number of JavaScript developers coming from Europe
16,333
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
7 kyu
80's Kids #5: You Can't Do That on Television
1,697
NateBrady23
1 Issue Reported
Fundamentals
Algorithms
Strings
Regular Expressions
7 kyu
Coding Meetup #3 - Higher-Order Functions Series - Is Ruby coming?
11,014
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
7 kyu
Bob's Short Forms
1,464
codeo
2 Issues Reported
Strings
Regular Expressions
Algorithms
Fundamentals
7 kyu
Sum of a Beach
4,990
megawatt
Fundamentals
Algorithms
Strings
Regular Expressions
6 kyu
Remove the parentheses
7,283
topping
2 Issues Reported
Strings
Algorithms
Regular Expressions
Fundamentals
6 kyu
Encrypt this!
23,597
suic
Fundamentals
Strings
Regular Expressions
Arrays
Ciphers
Algorithms
Cryptography
Security
6 kyu
Palindromes with a slight twist: vowels & consonants assessed separately
324
DominicDigital
Regular Expressions
Strings
Fundamentals
Algorithms
7 kyu
DigitAll
742
user2821739
Fundamentals
Strings
Regular Expressions
Algorithms
6 kyu
Convert ISBN-10 to ISBN-13
1,117
dienesviktor
Algorithms
Regular Expressions
Fundamentals
Strings
Beta
Timmy goes to college
27
juliankolbe
3 Issues Reported
Status:
Testing & feedback needed
Estimated Rank:
5 kyu
Regular Expressions
Algorithms
Fundamentals
Strings
Logic
Beta
RegEx Like a Boss #6: Valid Parenthesis
9
sgerodes
1 Issue Reported
Status:
Testing & feedback needed
Estimated Rank:
5 kyu
Mathematics
Regular Expressions
Strings
Fundamentals
Algorithms
Beta
RegEx Like a Boss #5 CodeGolf: Decimal Number Divisible By 3
28
sgerodes
2 Issues Reported
Status:
Waiting for issues to be resolved
Estimated Rank:
3 kyu
Mathematics
Regular Expressions
Strings
Fundamentals
Restricted
Algorithms
6 kyu
Clean up your Gibberish!
235
user3206136
1 Issue Reported
Fundamentals
Algorithms
Strings
Arrays
Regular Expressions
6 kyu
dataTypes String to Array
151
emmpak
Fundamentals
Strings
Arrays
Regular Expressions
Algorithms
4 kyu
IPv6 address validation and contraction
169
MindWanderer
6 Issues Reported
Algorithms
Fundamentals
Regular Expressions
Strings
Confirm
Collect:
undefined
Loading collection data...