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
ASCII Art
40
Algebra
35
Algorithms
3733
Angular
2
Arrays
525
Artificial Intelligence
5
Backend
1
Big Integers
12
Binary
47
Binary Search Trees
7
Binary Trees
11
Bits
31
Cellular Automata
4
Ciphers
42
Combinatorics
32
Compilers
4
Concurrency
1
Cryptography
58
Data Frames
1
Data Science
26
Data Structures
238
Databases
3
Date Time
44
Debugging
3
Decorator
1
Design Patterns
4
Discrete Mathematics
6
Domain Specific Languages
3
Dynamic Programming
55
Esoteric Languages
18
Filtering
10
Functional Programming
56
Fundamentals
636
Game Solvers
31
Games
163
Genetic Algorithms
6
Geometry
97
Graph Theory
80
Graphics
9
Graphs
9
Heaps
1
Image Processing
6
Interpreters
27
Iterators
8
JSON
4
Language Features
7
Linear Algebra
22
Linked Lists
17
Lists
103
Logic
181
Logic Programming
1
Machine Learning
17
Mathematics
795
Matrix
81
Memoization
23
Metaprogramming
8
Monads
4
Networks
6
Neural Networks
1
NumPy
2
Number Theory
54
Object-oriented Programming
49
Parsing
73
Performance
250
Permutations
28
Physics
9
Priority Queues
1
Probability
13
Puzzles
337
Queues
6
Reactive Programming
1
Recursion
112
Refactoring
6
Reflection
1
Regular Expressions
115
Restricted
44
Reverse Engineering
1
Riddles
7
SQL
7
Scheduling
6
Searching
8
Security
33
Set Theory
10
Sets
8
Simulation
13
Sorting
122
Stacks
7
State Machines
7
Statistics
21
Streams
9
Strings
602
Theorem Proving
29
Trees
37
Tutorials
13
Unicode
4
Web Scraping
1
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
3,733 Kata Found
7 kyu
Finding queens on the board
693
KapHullloK
1 Issue Reported
Algorithms
6 kyu
Parity bit - Error detecting code
938
pshp
Algorithms
Binary
Strings
Fundamentals
5 kyu
Fibonacci Factory Function
1,047
x-way
Mathematics
Algorithms
7 kyu
Simple equation reversal
3,087
KenKamau
Algorithms
6 kyu
Count the divisible numbers
3,505
joh_pot
1 Issue Reported
Fundamentals
Algorithms
7 kyu
Genetic Algorithm Series - #1 Generate
3,677
gabrielsiedler
2 Issues Reported
Strings
Fundamentals
Genetic Algorithms
Algorithms
5 kyu
Calculate Variance
2,645
eerwitt
3 Issues Reported
Statistics
Mathematics
Algorithms
6 kyu
Upside down numbers
2,564
KenKamau
Algorithms
5 kyu
Crossword Puzzle! (2x2)
295
rowcased
Puzzles
Algorithms
6 kyu
Parse a linked list from a string
2,505
donaldsebleung
1 Issue Reported
Linked Lists
Recursion
Algorithms
4 kyu
Objectify a URL Query String
2,951
OverZealous
1 Issue Reported
Algorithms
7 kyu
String doubles
3,217
KenKamau
Strings
Algorithms
5 kyu
Don't Drink the Water
2,860
NateBrady23
Algorithms
Arrays
Sorting
Lists
7 kyu
Calculate Two People's Individual Ages
3,494
AseelM
Fundamentals
Algorithms
Arrays
7 kyu
Weight of its Contents
2,692
dnolan
2 Issues Reported
Algorithms
Mathematics
5 kyu
Become The Ultimate Phychic
272
spacewalker
2 Issues Reported
Mathematics
Logic
Algorithms
Puzzles
4 kyu
Explosive Sum
9,154
surtich
2 Issues Reported
Algorithms
Mathematics
Fundamentals
6 kyu
Thue-Morse Sequence
803
SandQueen
Strings
Binary
Algorithms
6 kyu
Get Password from grid
870
kodejuice
Logic
Arrays
Algorithms
Data Structures
7 kyu
Round To Nearest
339
Insight
Arrays
Fundamentals
Algorithms
6 kyu
Multi-Base Numbers
60
LuggiStruggi
Algorithms
Mathematics
1 kyu
Game of Life in Reverse
56
lsnbr
1 Issue Reported
Algorithms
Cellular Automata
3 kyu
Count Connectivity Components
555
ecolban
1 Issue Reported
Strings
Algorithms
Graph Theory
6 kyu
Kids and candies
1,051
sebaas
Algorithms
Beta
Is this a valid Tic Tac Toe position?
18
SummerTheCoder
1 Issue Reported
Status:
Waiting for issues to be resolved
Arrays
Algorithms
Games
Logic
7 kyu
Finding Remainder Without Using '%' Operator
2,974
DivyanshBatham
2 Issues Reported
Mathematics
Restricted
Algorithms
6 kyu
Find the unique number
155,334
isqua
3 Issues Reported
Fundamentals
Algorithms
Arrays
Performance
6 kyu
Message Validator
4,122
frkn2076
5 Issues Reported
Algorithms
4 kyu
Decode the Morse code, advanced
15,609
jolaf
10 Issues Reported
Algorithms
7 kyu
Interlocking Binary Pairs
3,581
rowcased
Binary
Bits
Algorithms
Loading...
Confirm
Collect:
undefined
Loading collection data...