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
Algebra
3
Algorithms
44
Arrays
77
Binary
1
Bits
1
Combinatorics
4
Data Science
1
Data Structures
9
Design Patterns
1
Dynamic Programming
1
Functional Programming
1
Fundamentals
34
Games
3
Geometry
2
Language Features
1
Linear Algebra
2
Lists
6
Logic
5
Mathematics
77
Matrix
4
Parsing
1
Performance
6
Probability
1
Puzzles
12
Recursion
1
Regular Expressions
1
Restricted
3
Sorting
6
Strings
8
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
77 Kata Found
5 kyu
Divide and maximize
304
AveragePythonEnjoyer
1 Issue Reported
Puzzles
Lists
Arrays
Mathematics
6 kyu
Hyper Sphere
2,267
CrowdHailer
Mathematics
Arrays
Fundamentals
5 kyu
Mean Square Error
22,317
kylehill
Arrays
Mathematics
Algorithms
7 kyu
Nice Array
7,005
aweleshetu
2 Issues Reported
Arrays
Mathematics
Fundamentals
7 kyu
Unflatten a list (Easy)
1,668
user5036852
2 Issues Reported
Mathematics
Arrays
Algorithms
6 kyu
Help Mrs Jefferson
1,197
raulbc777
Fundamentals
Data Structures
Arrays
Mathematics
7 kyu
Char Code Calculation
12,222
PG1
2 Issues Reported
Fundamentals
Arrays
Strings
Mathematics
4 kyu
1 unique common number in every pair
112
Zzudo
Algorithms
Combinatorics
Arrays
Mathematics
Geometry
5 kyu
Faulty Data Recovery
128
guioconnor
Arrays
Algorithms
Mathematics
Data Structures
4 kyu
Sum by Factors
20,047
g964
3 Issues Reported
Arrays
Algorithms
Mathematics
6 kyu
Reducing by steps
4,510
g964
3 Issues Reported
Mathematics
Arrays
Functional Programming
Lists
Data Structures
6 kyu
PI approximation
5,739
g964
2 Issues Reported
Arrays
Mathematics
Fundamentals
5 kyu
What doesn't belong to these?
252
user5036852
Mathematics
Arrays
Puzzles
Algorithms
5 kyu
The Primes as a Result of the Longest Consecutive Sum I
192
raulbc777
Performance
Algorithms
Mathematics
Data Structures
Arrays
Fundamentals
7 kyu
sum2total
1,305
debri
Logic
Mathematics
Arrays
Lists
Fundamentals
6 kyu
Multidimensional Coordinate Encoding
135
dfhwze
Algorithms
Arrays
Mathematics
7 kyu
SCHEDULE YOUR DA(RRA)Y
1,427
alexis-l8
5 Issues Reported
Arrays
Algorithms
Mathematics
Fundamentals
5 kyu
Josephus Survivor
16,804
GiacomoSorbi
1 Issue Reported
Mathematics
Combinatorics
Algorithms
Lists
Arrays
7 kyu
Noonerize Me
1,608
webtechalex
Mathematics
Arrays
Algorithms
7 kyu
Matrix creation
3,256
Dmitry Kudla
Fundamentals
Arrays
Matrix
Linear Algebra
Mathematics
Language Features
6 kyu
Levels of Pascal's Pyramid
98
kylito
Arrays
Algorithms
Mathematics
Combinatorics
Recursion
6 kyu
Deep List Reverse
364
ArcaneIntegers
Mathematics
Arrays
Algorithms
4 kyu
Unflatten a list (Harder than easy)
316
user5036852
1 Issue Reported
Mathematics
Arrays
Algorithms
6 kyu
Even Odd Pattern #1
739
debri
1 Issue Reported
Logic
Arrays
Mathematics
Puzzles
5 kyu
Numbers with The Highest Amount of Divisors
603
raulbc777
4 Issues Reported
Fundamentals
Algorithms
Data Structures
Mathematics
Arrays
6 kyu
"Shoot But As I've Seen It In My Imagination"
192
raulbc777
1 Issue Reported
Arrays
Mathematics
Algebra
Probability
Data Science
6 kyu
Basics 03: Strings, Numbers and Calculation
1,978
smile67
1 Issue Reported
Strings
Fundamentals
Mathematics
Arrays
7 kyu
Basics 04: Rotate Matrix
2,022
smile67
1 Issue Reported
Fundamentals
Mathematics
Arrays
Matrix
7 kyu
Adding values of arrays in a shifted way
2,070
user5036852
2 Issues Reported
Mathematics
Arrays
Algorithms
2 kyu
6 By 6 Skyscrapers
2,523
FrankK
4 Issues Reported
Mathematics
Puzzles
Games
Arrays
Matrix
Algorithms
Loading...
Confirm
Collect:
undefined
Loading collection data...