Kata Library: JavaScript Practice
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
16
Algebra
1
Algorithms
442
Arrays
71
Big Integers
3
Binary
8
Bits
4
Ciphers
17
Cryptography
18
Data Structures
41
Date Time
7
Dynamic Programming
6
Esoteric Languages
1
Filtering
2
Functional Programming
17
Fundamentals
115
Game Solvers
1
Games
9
Genetic Algorithms
3
Geometry
8
Interpreters
2
Language Features
1
Lists
5
Logic
38
Mathematics
40
Matrix
1
Memoization
2
Number Theory
1
Object-oriented Programming
9
Parsing
30
Performance
11
Permutations
4
Puzzles
29
Queues
1
Recursion
8
Regular Expressions
58
Restricted
2
SQL
1
Searching
1
Security
15
Set Theory
1
Simulation
2
Sorting
17
Stacks
2
Statistics
1
Streams
1
Strings
442
Trees
2
Unicode
1
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
442 Kata Found
7 kyu
Pull your words together, man!
3,192
AJFarmar
Strings
Algorithms
4 kyu
Strip Comments
56,109
jhoffner
17 Issues Reported
Strings
Algorithms
6 kyu
Hex to base64
477
e.mihaylin
1 Issue Reported
Strings
Algorithms
7 kyu
UVB-76 Message Validator
1,254
Drymonade
Algorithms
Strings
Regular Expressions
6 kyu
Parity bit - Error detecting code
1,026
pshp
Algorithms
Binary
Strings
Fundamentals
7 kyu
Genetic Algorithm Series - #1 Generate
3,729
gabrielsiedler
2 Issues Reported
Strings
Fundamentals
Genetic Algorithms
Algorithms
7 kyu
String doubles
3,319
KenKamau
Strings
Algorithms
6 kyu
Thue-Morse Sequence
835
SandQueen
Strings
Binary
Algorithms
5 kyu
Four Letter Words ~ Mutations
699
rowcased
Strings
Arrays
Games
Parsing
Algorithms
8 kyu
Reversed Words
89,327
jhoffner
2 Issues Reported
Strings
Algorithms
6 kyu
Coding Meetup #10 - Higher-Order Functions Series - Create usernames
3,505
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
6 kyu
Simple Substitution Cipher Helper
3,826
jacobb
Ciphers
Security
Object-oriented Programming
Strings
Algorithms
5 kyu
Convert all the cases!
1,657
AJFarmar
1 Issue Reported
Strings
Regular Expressions
Algorithms
7 kyu
Multiply Word in String
4,978
ArmandLluka
1 Issue Reported
Strings
Algorithms
Fundamentals
Arrays
5 kyu
Base64 Encoding
5,397
joseph.varnado
2 Issues Reported
Binary
Strings
Algorithms
7 kyu
Street Bowling
346
Yeetboii1
Algorithms
Strings
6 kyu
Playing with passphrases
12,084
g964
4 Issues Reported
Strings
Algorithms
6 kyu
Hidden "Cubic" numbers
3,282
g964
3 Issues Reported
Algorithms
Strings
6 kyu
[Code Golf] NightmareScript #2 (Stringy Strings)
46
Simple Rick
Restricted
Strings
Algorithms
5 kyu
Four Letter Words ~ Anagrams
93
rowcased
Algorithms
Games
Game Solvers
Lists
Strings
Parsing
Fundamentals
4 kyu
Vigenère Cipher Helper
9,009
jacobb
4 Issues Reported
Algorithms
Ciphers
Security
Object-oriented Programming
Strings
6 kyu
FIRE and FURY
1,551
dinglemouse
1 Issue Reported
Regular Expressions
Strings
Algorithms
7 kyu
Coding Meetup #4 - Higher-Order Functions Series - Find the first Python developer
10,383
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
Regular Expressions
7 kyu
Coding Meetup #2 - Higher-Order Functions Series - Greet developers
12,850
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
16,611
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
8 kyu
Neutralisation
12,783
saudiGuy
Algorithms
Strings
7 kyu
Genetic Algorithm Series - #3 Crossover
2,263
gabrielsiedler
2 Issues Reported
Strings
Algorithms
Genetic Algorithms
6 kyu
Explain the Algebraic Chess Notation
151
Abiyasash3565
Algorithms
Strings
Parsing
6 kyu
Arrh, grabscrab!
7,541
matstc
2 Issues Reported
Strings
Algorithms
6 kyu
Draw a Circle.
305
AJFarmar
1 Issue Reported
Strings
Geometry
ASCII Art
Algorithms
Loading...
Confirm
Collect:
undefined
Loading collection data...