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
56
Arrays
45
Binary Trees
3
Compilers
2
Data Structures
29
Debugging
2
Decorator
1
Esoteric Languages
2
Functional Programming
187
Fundamentals
107
Interpreters
2
Iterators
1
Language Features
1
Lists
18
Logic
2
Mathematics
7
Metaprogramming
2
Monads
2
Networks
1
Object-oriented Programming
2
Parsing
2
Performance
1
Puzzles
10
Recursion
6
Refactoring
5
Regular Expressions
4
Restricted
5
Set Theory
1
Sets
1
Sorting
2
Stacks
1
Streams
3
Strings
22
Theorem Proving
14
Trees
3
Tutorials
2
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
187 Kata Found
6 kyu
Coding Meetup #10 - Higher-Order Functions Series - Create usernames
3,491
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
7 kyu
Homogenous arrays
4,486
lilsweetcaligula
Arrays
Fundamentals
Functional Programming
7 kyu
Existential Crisis
21
tobeannouncd
Functional Programming
Debugging
Fundamentals
7 kyu
Coding Meetup #4 - Higher-Order Functions Series - Find the first Python developer
10,357
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
Regular Expressions
7 kyu
Coding Meetup #2 - Higher-Order Functions Series - Greet developers
12,823
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
16,570
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
7 kyu
Sum of Odd Cubed Numbers
11,653
elliottmck
5 Issues Reported
Fundamentals
Functional Programming
Arrays
5 kyu
Calculating with Functions
86,914
BattleRattle
Functional Programming
7 kyu
Coding Meetup #3 - Higher-Order Functions Series - Is Ruby coming?
11,111
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
6 kyu
Some Fun with Aggregate Operations (Part 3)
310
zavanton123
Functional Programming
Fundamentals
7 kyu
Unpacking Arguments
13,405
user578387
1 Issue Reported
Functional Programming
Fundamentals
6 kyu
zipWith
7,281
JohanWiltink
Lists
Arrays
Functional Programming
Algorithms
6 kyu
Reducing by steps
4,524
g964
3 Issues Reported
Mathematics
Arrays
Functional Programming
Lists
Data Structures
1 kyu
Functional SQL
2,892
surtich
2 Issues Reported
Functional Programming
Algorithms
6 kyu
Once
6,197
osuushi
3 Issues Reported
Functional Programming
Fundamentals
5 kyu
Partition On
6,660
jcorbin@wunjo.org
1 Issue Reported
Functional Programming
Arrays
Algorithms
7 kyu
Functional Addition
18,765
amrdraz
Functional Programming
Fundamentals
6 kyu
Unary function chainer
7,257
tpatja
Functional Programming
Fundamentals
7 kyu
First-Class Function Factory
7,640
otajor
Fundamentals
Functional Programming
Arrays
7 kyu
Pair Zeros
2,369
Nianpeng
Algorithms
Arrays
Fundamentals
Functional Programming
7 kyu
Currying functions: multiply all elements in an array
16,234
limeyb7
1 Issue Reported
Functional Programming
Fundamentals
8 kyu
Dollars and Cents
25,903
kolohelios
1 Issue Reported
Functional Programming
Strings
Algorithms
5 kyu
Creating a new LINQ operator: SelectConsecutive
132
LesRamer
Functional Programming
Fundamentals
6 kyu
First Class Factorial Function
199
Anarki
Fundamentals
Functional Programming
2 kyu
Algebraic Isomorphism
549
lolisa
Functional Programming
Fundamentals
Tutorials
7 kyu
Coding Meetup #17 - Higher-Order Functions Series - Sort by programming language
2,160
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Sorting
4 kyu
Functional streams
775
muesli4
2 Issues Reported
Streams
Functional Programming
Algorithms
6 kyu
A functional deck of cards....
881
thatrubylove
5 Issues Reported
Functional Programming
Fundamentals
2 kyu
Regular expression parser
1,162
phaul
15 Issues Reported
Parsing
Functional Programming
Algorithms
6 kyu
Fun with lists: map
1,705
janitormeir
Lists
Functional Programming
Fundamentals
Loading...
Confirm
Collect:
undefined
Loading collection data...