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
18
Algebra
1
Algorithms
115
Arrays
163
Asynchronous
1
Big Integers
2
Binary
8
Bits
5
Ciphers
7
Combinatorics
3
Cryptography
6
Data Science
1
Data Structures
38
Date Time
5
Design Patterns
1
Dynamic Programming
1
Esoteric Languages
2
Functional Programming
19
Fundamentals
673
Game Solvers
1
Games
6
Genetic Algorithms
1
Geometry
4
Interpreters
3
Language Features
1
Lists
11
Logic
30
Mathematics
48
Matrix
2
MongoDB
1
Networks
2
Number Theory
1
Object-oriented Programming
1
Parsing
22
Performance
2
Permutations
3
Puzzles
15
Queues
1
Recursion
3
Refactoring
1
Regular Expressions
116
Restricted
5
Riddles
1
Security
2
Simulation
2
Sorting
19
Statistics
1
Strings
673
Trees
1
Tutorials
1
Unicode
2
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
673 Kata Found
7 kyu
Return substring instance count
8,475
jhoffner
Strings
Fundamentals
7 kyu
Mumbling
239,644
g964
Fundamentals
Strings
Puzzles
6 kyu
Mexican Wave
73,568
adrian.eyre
3 Issues Reported
Arrays
Strings
Fundamentals
8 kyu
Sort and Star
52,022
PG1
2 Issues Reported
Fundamentals
Strings
Arrays
Sorting
8 kyu
Is there a vowel in there?
15,605
PG1
2 Issues Reported
Fundamentals
Strings
Arrays
7 kyu
Array Array Array
4,495
PG1
Fundamentals
Strings
Arrays
7 kyu
Search for letters
7,435
Roy Gardiner
Strings
Fundamentals
7 kyu
Scrabble Score
4,638
noku
1 Issue Reported
Fundamentals
Strings
7 kyu
Unique string characters
7,808
KenKamau
Strings
Fundamentals
6 kyu
Most Consecutive Zeros of a Binary Number
718
ajLapid718
1 Issue Reported
Fundamentals
Mathematics
Strings
6 kyu
Create a frame!
1,672
gabrielsiedler
Strings
Arrays
ASCII Art
Fundamentals
7 kyu
Return a string's even characters.
8,244
tu6619
Fundamentals
Strings
Arrays
7 kyu
Format to the 2nd
689
ecolban
Strings
Fundamentals
Beta
Who’s That Man in the Picture?
14
Bree-Mass
Status:
Testing & feedback needed
Estimated Rank:
6 kyu
Logic
Strings
Arrays
Parsing
Fundamentals
Riddles
8 kyu
Remove exclamation marks
124,591
wichu
2 Issues Reported
Fundamentals
Strings
6 kyu
ASCII hex converter
3,464
sahglie
Fundamentals
Strings
7 kyu
Name Array Capping
8,736
ogryzek
1 Issue Reported
Strings
Arrays
Fundamentals
7 kyu
Partial Word Searching
8,092
obnounce
4 Issues Reported
Arrays
Strings
Fundamentals
7 kyu
Greet Me
23,818
ogryzek
Strings
Fundamentals
7 kyu
Help Mr. E
953
methree
1 Issue Reported
Strings
Fundamentals
Regular Expressions
3 kyu
Divide integers as strings
1,089
Voile
Strings
Fundamentals
Big Integers
Algorithms
6 kyu
IntroToArt
902
citharista
1 Issue Reported
Arrays
Strings
ASCII Art
Fundamentals
7 kyu
Hëävÿ Mëtäl Ümläüts
1,380
tachyonlabs
Strings
Fundamentals
5 kyu
Resistor Color Codes, Part 2
2,107
tachyonlabs
3 Issues Reported
Strings
Fundamentals
6 kyu
Help Green Lantern with his web site
379
tachyonlabs
Strings
Fundamentals
5 kyu
Alphabet wars - nuclear strike
1,734
dcieslak
Strings
Regular Expressions
Fundamentals
6 kyu
DevOps legacy roasting -> disco inferno -> burn baby burn
292
user8476848
2 Issues Reported
Regular Expressions
Strings
Fundamentals
6 kyu
Binary to Text (ASCII) Conversion
5,553
deanvn
4 Issues Reported
Binary
Strings
Fundamentals
7 kyu
80's Kids #5: You Can't Do That on Television
1,689
NateBrady23
1 Issue Reported
Fundamentals
Algorithms
Strings
Regular Expressions
6 kyu
File Path Operations
1,735
user2514386
3 Issues Reported
Fundamentals
Strings
Restricted
Loading...
Confirm
Collect:
undefined
Loading collection data...