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
6 kyu
Explain the Algebraic Chess Notation
121
Abiyasash3565
Algorithms
Strings
Parsing
6 kyu
Arrh, grabscrab!
7,325
matstc
2 Issues Reported
Strings
Algorithms
6 kyu
Draw a Circle.
280
AJFarmar
1 Issue Reported
Strings
Geometry
ASCII Art
Algorithms
6 kyu
Split Strings
166,870
jhoffner
Regular Expressions
Strings
Algorithms
6 kyu
FIRE and FURY
1,313
dinglemouse
1 Issue Reported
Regular Expressions
Strings
Algorithms
7 kyu
Lojban Numbers
706
alexlostorto
Strings
Algorithms
Parsing
7 kyu
String to list of integers.
1,073
Nippius
Strings
Algorithms
7 kyu
Mirroring cipher
829
user8580805
Strings
Cryptography
Security
Algorithms
6 kyu
Keyword Cipher
1,295
user8580805
Cryptography
Strings
Algorithms
6 kyu
Name to Matrix
968
Coder_38
1 Issue Reported
Strings
Arrays
Algorithms
Matrix
7 kyu
Replace every nth
4,643
user5036852
Algorithms
Strings
3 kyu
Divide integers as strings
1,085
Voile
Strings
Fundamentals
Big Integers
Algorithms
5 kyu
Return substring instance count - 2
3,164
ineiti
2 Issues Reported
Strings
Regular Expressions
Algorithms
6 kyu
A String of Sorts
1,964
Lordnibbler
Strings
Sorting
Algorithms
7 kyu
80's Kids #5: You Can't Do That on Television
1,689
NateBrady23
1 Issue Reported
Fundamentals
Algorithms
Strings
Regular Expressions
7 kyu
Email Address Obfuscator
4,550
jaxDid
3 Issues Reported
Strings
Algorithms
7 kyu
Coding Meetup #3 - Higher-Order Functions Series - Is Ruby coming?
10,965
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
7 kyu
Print a Rectangle Using Asterisks
949
GrahamD
2 Issues Reported
Strings
ASCII Art
Algorithms
6 kyu
Palindrome for your Dome
3,600
driedyam
2 Issues Reported
Logic
Strings
Algorithms
7 kyu
DNA GC-content
939
nbeck
Strings
Algorithms
5 kyu
The Hashtag Generator
105,043
AKJ.IO
15 Issues Reported
Strings
Algorithms
5 kyu
Thoughts in Motion: Echoing Waves
31
dfhwze
Algorithms
Strings
ASCII Art
6 kyu
Missing Alphabet
1,309
MicheleCarbone
1 Issue Reported
Strings
Algorithms
Games
7 kyu
UVB-76 Message Validator
1,115
Drymonade
Algorithms
Strings
Regular Expressions
7 kyu
Transposing a song
1,282
hwtdstrngls
Fundamentals
Algorithms
Strings
Lists
6 kyu
Nut Farm
1,203
dinglemouse
2 Issues Reported
Strings
Algorithms
7 kyu
Genetic Algorithm Series - #1 Generate
3,608
gabrielsiedler
2 Issues Reported
Strings
Fundamentals
Genetic Algorithms
Algorithms
5 kyu
Translate DNA in 6 frames
296
nbeck
2 Issues Reported
Strings
Algorithms
6 kyu
Linux history and `!` command. Series#5 The `!?string` command
299
nbeck
1 Issue Reported
Strings
Parsing
Regular Expressions
Algorithms
6 kyu
Linux history and `!` command. Series#4 The `!string` command
292
nbeck
3 Issues Reported
Strings
Parsing
Regular Expressions
Algorithms
Loading...
Confirm
Collect:
undefined
Loading collection data...