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
2
Algebra
2
Algorithms
413
Arrays
413
Binary
5
Binary Search Trees
1
Binary Trees
1
Bits
5
Ciphers
2
Combinatorics
4
Cryptography
4
Data Science
1
Data Structures
47
Date Time
2
Dynamic Programming
5
Filtering
4
Functional Programming
24
Fundamentals
99
Games
24
Genetic Algorithms
2
Geometry
4
Graph Theory
1
Graphics
2
Iterators
2
Lists
29
Logic
21
Mathematics
44
Matrix
13
Object-oriented Programming
5
Parsing
4
Performance
28
Permutations
3
Physics
2
Puzzles
26
Queues
1
Recursion
13
Regular Expressions
15
Restricted
3
Security
2
Sets
1
Simulation
1
Sorting
40
Statistics
2
Streams
1
Strings
71
Trees
2
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
413 Kata Found
4 kyu
Smallest possible sum
8,226
dkhaburdzania
7 Issues Reported
Algorithms
Mathematics
Arrays
6 kyu
Is this a valid Tic Tac Toe position?
277
SummerTheCoder
Arrays
Algorithms
Games
Logic
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
6 kyu
Wave Sorting
2,110
kodejuice
5 Issues Reported
Algorithms
Arrays
Logic
Sorting
6 kyu
Rotate Array (JS)
2,405
ZozoFouchtra
3 Issues Reported
Arrays
Algorithms
6 kyu
Find the Mine!
7,216
xDranik
Arrays
Algorithms
5 kyu
Don't Drink the Water
2,947
NateBrady23
Algorithms
Arrays
Sorting
Lists
7 kyu
Calculate Two People's Individual Ages
3,575
AseelM
Fundamentals
Algorithms
Arrays
6 kyu
Get Password from grid
910
kodejuice
Logic
Arrays
Algorithms
Data Structures
6 kyu
Find the unique number
155,996
isqua
3 Issues Reported
Fundamentals
Algorithms
Arrays
Performance
5 kyu
Four Letter Words ~ Mutations
699
rowcased
Strings
Arrays
Games
Parsing
Algorithms
6 kyu
Split and then add both sides of an array together.
3,487
bori0066
Arrays
Algorithms
8 kyu
Find numbers which are divisible by given number
45,280
XxxX88
1 Issue Reported
Arrays
Algorithms
8 kyu
Count the Monkeys!
74,451
PG1
1 Issue Reported
Arrays
Fundamentals
Lists
Algorithms
6 kyu
Find the most frequently occurring elements in arrays
493
PiotrBerebecki
Algorithms
Data Structures
Arrays
Data Science
6 kyu
I need more speed!
2,874
joh_pot
Arrays
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
Equal Sides Of An Array
134,472
Shivo
Algorithms
Arrays
Fundamentals
6 kyu
Array Exchange
1,606
hafizio
Arrays
Algorithms
Fundamentals
7 kyu
Multiply Word in String
4,978
ArmandLluka
1 Issue Reported
Strings
Algorithms
Fundamentals
Arrays
7 kyu
Array element parity
9,774
KenKamau
1 Issue Reported
Arrays
Algorithms
6 kyu
Array intersect all
633
ankr
3 Issues Reported
Arrays
Algorithms
6 kyu
Holiday Shopping Priority Queue
963
xDranik
1 Issue Reported
Queues
Arrays
Algorithms
7 kyu
80's Kids #2: Help ALF Find His Spaceship
2,322
NateBrady23
4 Issues Reported
Arrays
Algorithms
7 kyu
Coding Meetup #4 - Higher-Order Functions Series - Find the first Python developer
10,384
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
16,613
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
5 kyu
Mean Square Error
22,970
kylehill
Arrays
Mathematics
Algorithms
5 kyu
Interleaving Arrays
2,195
arlaneenalra
Algorithms
Arrays
7 kyu
nova polynomial 4. derivative
416
hgamboa
1 Issue Reported
Algorithms
Recursion
Arrays
Loading...
Confirm
Collect:
undefined
Loading collection data...