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
Algebra
3
Algorithms
24
Arrays
53
Binary
3
Binary Trees
2
Bits
1
Data Frames
1
Data Science
2
Data Structures
17
Design Patterns
1
Dynamic Programming
1
Filtering
2
Functional Programming
10
Fundamentals
149
Game Solvers
1
Games
2
Graph Theory
3
Graphics
1
Iterators
1
Linear Algebra
2
Linked Lists
1
Lists
149
Logic
5
Mathematics
11
Matrix
3
Number Theory
2
Object-oriented Programming
1
Parsing
2
Performance
3
Permutations
1
Puzzles
5
Queues
1
React
1
Recursion
4
Regular Expressions
2
Restricted
1
Sorting
9
Statistics
1
Strings
19
Theorem Proving
2
Trees
2
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
149 Kata Found
7 kyu
Unique Sum
4,466
Alpri Else
Lists
Logic
Filtering
Fundamentals
6 kyu
Sum of prime-indexed elements
3,063
KenKamau
1 Issue Reported
Lists
Fundamentals
7 kyu
Baby shark lyrics generator
2,857
albertogcmr
1 Issue Reported
Strings
Lists
Fundamentals
Restricted
6 kyu
English beggars
9,880
GiacomoSorbi
Queues
Arrays
Lists
Recursion
Fundamentals
7 kyu
Alternate Square Sum
3,959
hakunaMatata
Fundamentals
Arrays
Lists
8 kyu
Invert values
181,318
user7657844
1 Issue Reported
Lists
Fundamentals
Arrays
8 kyu
Count the Monkeys!
74,322
PG1
1 Issue Reported
Arrays
Fundamentals
Lists
Algorithms
8 kyu
Return Two Highest Values in List
11,214
resticate
1 Issue Reported
Fundamentals
Lists
8 kyu
Square(n) Sum
308,553
jhoffner
1 Issue Reported
Arrays
Lists
Fundamentals
7 kyu
99 Problems, #1: last in list
3,978
spencerwi
Lists
Fundamentals
8 kyu
Duck Duck Goose
15,895
10XL
1 Issue Reported
Arrays
Lists
Fundamentals
7 kyu
List Filtering
305,138
cmgerber
2 Issues Reported
Lists
Filtering
Data Structures
Fundamentals
5 kyu
Four Letter Words ~ Anagrams
92
rowcased
Algorithms
Games
Game Solvers
Lists
Strings
Parsing
Fundamentals
8 kyu
Count of positives / sum of negatives
165,280
Dentzil
10 Issues Reported
Fundamentals
Arrays
Lists
8 kyu
Removing Elements
83,387
MorgzC41
1 Issue Reported
Lists
Arrays
Fundamentals
8 kyu
Remove duplicates from list
40,165
wichu
2 Issues Reported
Fundamentals
Arrays
Lists
6 kyu
Fibonacci, Tribonacci and friends
13,896
GiacomoSorbi
13 Issues Reported
Arrays
Lists
Number Theory
Fundamentals
7 kyu
Head, Tail, Init and Last
17,528
user578387
1 Issue Reported
Arrays
Lists
Fundamentals
7 kyu
Transposing a song
1,297
hwtdstrngls
Fundamentals
Algorithms
Strings
Lists
5 kyu
Scrabble Checker
52
Paul Robertson
Algorithms
Games
Lists
Arrays
Fundamentals
8 kyu
Add Length
38,390
debri
Arrays
Lists
Fundamentals
7 kyu
Alphabetize a list by the nth character
2,051
edm2410
5 Issues Reported
Lists
Strings
Sorting
Arrays
Fundamentals
6 kyu
Is there a sequence re-occuring in the list
382
IVBakker
Arrays
Lists
Fundamentals
Performance
6 kyu
Evaluating prefix Polish notation
740
interphx
Parsing
Mathematics
Algorithms
Lists
Strings
Fundamentals
7 kyu
Sort the climbing grades
1,242
Chris_Rands
Fundamentals
Lists
Data Structures
Sorting
Arrays
Strings
7 kyu
sum2total
1,324
debri
Logic
Mathematics
Arrays
Lists
Fundamentals
7 kyu
Sum of differences between products and LCMs
1,849
GiacomoSorbi
2 Issues Reported
Arrays
Lists
Fundamentals
7 kyu
Sum of a nested list
3,229
kingcobra
Recursion
Lists
Algorithms
Fundamentals
7 kyu
Reverse and Invert
1,203
user7657844
2 Issues Reported
Lists
Fundamentals
6 kyu
Tribonacci Sequence
162,443
GiacomoSorbi
7 Issues Reported
Number Theory
Arrays
Lists
Fundamentals
Loading...
Confirm
Collect:
undefined
Loading collection data...