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
7
Algebra
1
Algorithms
99
Arrays
633
Binary
9
Bits
6
Ciphers
2
Combinatorics
1
Cryptography
3
Data Science
3
Data Structures
32
Date Time
3
Debugging
2
Design Patterns
1
Esoteric Languages
2
Filtering
1
Functional Programming
32
Fundamentals
633
Games
21
Geometry
3
Graph Theory
4
Graphics
1
Graphs
1
Image Processing
2
Interpreters
2
Iterators
1
JSON
1
Language Features
3
Linear Algebra
2
Lists
40
Logic
12
Mathematics
34
Matrix
10
Number Theory
3
Object-oriented Programming
4
Parsing
3
Performance
14
Permutations
1
Physics
1
Probability
1
Promises
1
Puzzles
9
Queues
1
Recursion
10
Refactoring
2
Regular Expressions
27
Restricted
1
Riddles
1
Security
2
Sets
2
Simulation
1
Sorting
46
Statistics
3
Strings
163
Tutorials
1
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
633 Kata Found
7 kyu
String Scramble
3,147
Dragoris
1 Issue Reported
Fundamentals
Strings
Arrays
8 kyu
Merge two sorted arrays into one
40,617
Y.y
1 Issue Reported
Fundamentals
Arrays
Beta
Maximum Sum of a Subarray of Fixed Size
18
arinjayg
Status:
Testing & feedback needed
Estimated Rank:
6 kyu
Algorithms
Arrays
Data Structures
Fundamentals
Performance
8 kyu
Sum Mixed Array
108,885
PG1
1 Issue Reported
Fundamentals
Strings
Arrays
8 kyu
Enumerable Magic #1 - True for All?
13,522
bellmyer
2 Issues Reported
Arrays
Fundamentals
7 kyu
The reject() function
4,958
user5363957
1 Issue Reported
Arrays
Fundamentals
8 kyu
Logical calculator
10,188
aniametz
1 Issue Reported
Arrays
Fundamentals
7 kyu
Convert the score
3,926
Nspringham
Fundamentals
Arrays
7 kyu
Driving Licence
4,307
adrian.eyre
4 Issues Reported
Strings
Arrays
Fundamentals
8 kyu
Sum Arrays
205,507
richardhsu
4 Issues Reported
Arrays
Fundamentals
7 kyu
Hit Count
3,601
glenoakes
3 Issues Reported
Arrays
Fundamentals
6 kyu
Duplicates. Duplicates Everywhere.
2,633
bretcameron
Arrays
Sets
Sorting
Fundamentals
7 kyu
Calculate Two People's Individual Ages
3,576
AseelM
Fundamentals
Algorithms
Arrays
7 kyu
Double Trouble
3,893
PG1
1 Issue Reported
Fundamentals
Arrays
7 kyu
Help the Fruit Guy
8,050
user3028132
3 Issues Reported
Arrays
Strings
Fundamentals
6 kyu
Fruit Machine
3,647
adrian.eyre
1 Issue Reported
Arrays
Games
Fundamentals
6 kyu
Find the unique number
156,002
isqua
3 Issues Reported
Fundamentals
Algorithms
Arrays
Performance
6 kyu
English beggars
9,897
GiacomoSorbi
Queues
Arrays
Lists
Recursion
Fundamentals
8 kyu
Array plus array
92,126
Dmitry Kudla
1 Issue Reported
Fundamentals
Arrays
Debugging
6 kyu
Organise duplicate numbers in list
2,613
dangerdak
Arrays
Sorting
Fundamentals
6 kyu
Does array x contain all values within array y?
2,915
jhoffner
2 Issues Reported
Arrays
Fundamentals
7 kyu
CompoundArray
2,871
Delacroix23
Arrays
Fundamentals
7 kyu
Alternate Square Sum
3,976
hakunaMatata
Fundamentals
Arrays
Lists
8 kyu
Invert values
181,818
user7657844
1 Issue Reported
Lists
Fundamentals
Arrays
8 kyu
Count the Monkeys!
74,453
PG1
1 Issue Reported
Arrays
Fundamentals
Lists
Algorithms
8 kyu
Total amount of points
119,177
petrosernivka
1 Issue Reported
Fundamentals
Arrays
Strings
8 kyu
Count by X
154,842
shums16
Arrays
Fundamentals
8 kyu
Convert a string to an array
158,558
samjam48
3 Issues Reported
Arrays
Strings
Fundamentals
7 kyu
Dominant array elements
4,479
KenKamau
1 Issue Reported
Arrays
Fundamentals
8 kyu
Beginner - Reduce but Grow
171,502
PG1
1 Issue Reported
Fundamentals
Arrays
Loading...
Confirm
Collect:
undefined
Loading collection data...