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
24
Binary Trees
3
Compilers
1
Data Structures
24
Esoteric Languages
2
Functional Programming
56
Fundamentals
22
Interpreters
2
Lists
8
Logic
2
Mathematics
2
Monads
1
Parsing
1
Performance
1
Recursion
4
Regular Expressions
4
Set Theory
1
Sorting
1
Stacks
1
Streams
2
Strings
17
Theorem Proving
2
Trees
3
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
56 Kata Found
6 kyu
Coding Meetup #10 - Higher-Order Functions Series - Create usernames
3,480
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
7 kyu
Coding Meetup #4 - Higher-Order Functions Series - Find the first Python developer
10,337
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
Regular Expressions
7 kyu
Coding Meetup #2 - Higher-Order Functions Series - Greet developers
12,797
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
16,532
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
7 kyu
Coding Meetup #3 - Higher-Order Functions Series - Is Ruby coming?
11,094
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
6 kyu
zipWith
7,276
JohanWiltink
Lists
Arrays
Functional Programming
Algorithms
1 kyu
Functional SQL
2,889
surtich
3 Issues Reported
Functional Programming
Algorithms
5 kyu
Partition On
6,653
jcorbin@wunjo.org
1 Issue Reported
Functional Programming
Arrays
Algorithms
7 kyu
Pair Zeros
2,368
Nianpeng
Algorithms
Arrays
Fundamentals
Functional Programming
8 kyu
Dollars and Cents
25,884
kolohelios
1 Issue Reported
Functional Programming
Strings
Algorithms
7 kyu
Coding Meetup #17 - Higher-Order Functions Series - Sort by programming language
2,156
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Sorting
4 kyu
Functional streams
774
muesli4
2 Issues Reported
Streams
Functional Programming
Algorithms
2 kyu
Regular expression parser
1,157
phaul
15 Issues Reported
Parsing
Functional Programming
Algorithms
6 kyu
The takeWhile Function
2,466
jgdodson
2 Issues Reported
Functional Programming
Arrays
Algorithms
Lists
Data Structures
7 kyu
The dropWhile Function
3,494
jgdodson
1 Issue Reported
Functional Programming
Arrays
Algorithms
6 kyu
Binding of Algebraic Data Types
53
Dr Gabo
Functional Programming
Algorithms
7 kyu
Coding Meetup #5 - Higher-Order Functions Series - Prepare the count of languages
8,286
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
4 kyu
Prepare the Cocktails
27
bledding
Algorithms
Functional Programming
Performance
Recursion
Set Theory
6 kyu
Array#reduce
4,419
user578387
2 Issues Reported
Functional Programming
Algorithms
7 kyu
The Span Function
2,184
jgdodson
1 Issue Reported
Functional Programming
Algorithms
6 kyu
zipWith II: Lists :]
168
JohanWiltink
Lists
Arrays
Data Structures
Functional Programming
Algorithms
6 kyu
Cookie Creator
101
lpabst
Strings
Functional Programming
Algorithms
Beta
Lazily Grouping
8
oisdk
Status:
Testing & feedback needed
Estimated Rank:
5 kyu
Algorithms
Functional Programming
Lists
5 kyu
Fun with lists: trees edition
306
janitormeir
Trees
Lists
Functional Programming
Fundamentals
Binary Trees
Data Structures
Algorithms
Beta
Lambda Calculus: group-by
8
JohanWiltink
Status:
Ranking feedback needed
Estimated Rank:
6 kyu
Functional Programming
Algorithms
1 kyu
Lambda Calculus: Lists as folds II
33
JohanWiltink
Algorithms
Lists
Data Structures
Functional Programming
Beta
Makeshift pattern matching
3
Anon2028
Status:
Testing & feedback needed
Estimated Rank:
4 kyu
Algorithms
Fundamentals
Functional Programming
Recursion
6 kyu
Factorial Lambda Calculus
77
JohanWiltink
Functional Programming
Algorithms
6 kyu
Coding Meetup #13 - Higher-Order Functions Series - Is the meetup language-diverse?
3,142
PiotrBerebecki
1 Issue Reported
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
6 kyu
Coding Meetup #16 - Higher-Order Functions Series - Ask for missing details
2,533
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
Loading...
Confirm
Collect:
undefined
Loading collection data...