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
Algorithms
30
Arrays
6
Binary
3
Bits
2
Date Time
1
Fundamentals
22
Game Solvers
1
Games
2
Interpreters
2
Lists
2
Logic
4
Mathematics
4
Object-oriented Programming
1
Parsing
46
Puzzles
2
Recursion
3
Regular Expressions
8
Restricted
1
Riddles
1
Strings
46
Trees
1
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
46 Kata Found
6 kyu
Explain the Algebraic Chess Notation
121
Abiyasash3565
Algorithms
Strings
Parsing
7 kyu
Lojban Numbers
706
alexlostorto
Strings
Algorithms
Parsing
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
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
6 kyu
Linux history and `!` command. Series#3 The `!-n` command
300
nbeck
3 Issues Reported
Strings
Parsing
Regular Expressions
Algorithms
6 kyu
Linux history and `!` command. Series#2 The `!n` command
411
nbeck
Strings
Parsing
Regular Expressions
Algorithms
6 kyu
Linux history and `!` command. Series#1 The `!!` command
639
nbeck
Strings
Parsing
Regular Expressions
Algorithms
6 kyu
Evaluating prefix Polish notation
729
interphx
Parsing
Mathematics
Algorithms
Lists
Strings
Fundamentals
4 kyu
Simplifying multilinear polynomials
4,971
SleepingCode
6 Issues Reported
Mathematics
Strings
Regular Expressions
Parsing
Fundamentals
7 kyu
char_to_ascii
1,654
kromitj
3 Issues Reported
Strings
Parsing
Fundamentals
7 kyu
Correct the date-string
483
user5036852
Parsing
Strings
Fundamentals
5 kyu
Four Letter Words ~ Mutations
653
rowcased
Strings
Arrays
Games
Parsing
Algorithms
4 kyu
Simplexer
746
Mihail-K
3 Issues Reported
Strings
Parsing
Algorithms
6 kyu
Parse HTML/CSS Colors
2,770
junthecoder
2 Issues Reported
Fundamentals
Algorithms
Strings
Parsing
5 kyu
Molecule to atoms
6,021
romanzes
3 Issues Reported
Parsing
Algorithms
Strings
7 kyu
Correct the time-string
5,338
user5036852
3 Issues Reported
Parsing
Strings
Fundamentals
7 kyu
Valid Parentheses
9,027
Kacarott
Strings
Parsing
Algorithms
6 kyu
Reverse polish notation calculator
11,487
vgrichina
4 Issues Reported
Algorithms
Mathematics
Interpreters
Parsing
Strings
7 kyu
Convert an array of strings to array of numbers
16,508
romerojp
Arrays
Parsing
Strings
Fundamentals
4 kyu
parseInt() reloaded
18,728
BattleRattle
7 Issues Reported
Parsing
Strings
Algorithms
5 kyu
Four Letter Words ~ Anagrams
60
rowcased
Algorithms
Games
Game Solvers
Lists
Strings
Parsing
Fundamentals
8 kyu
Convert a String to a Number!
287,700
bkaes
Parsing
Strings
Fundamentals
6 kyu
Proquints: Pro-nouncable Quint-uplets
76
stellartux
Strings
Parsing
Binary
6 kyu
Acronym Buster
546
pbywater
5 Issues Reported
Regular Expressions
Parsing
Strings
Algorithms
5 kyu
Reverse Inside Parentheses (Inside Parentheses)
618
dmercertaylor
1 Issue Reported
Strings
Fundamentals
Recursion
Parsing
5 kyu
Convert A Hex String To RGB
15,924
Krxtopher
Parsing
Strings
Algorithms
5 kyu
Convert cursed data from parallel universe into an object
56
brunolm
Recursion
Parsing
Strings
Trees
Algorithms
5 kyu
Ninety Nine Thousand Nine Hundred Ninety Nine
1,037
jimmylorunning
1 Issue Reported
Strings
Parsing
Algorithms
6 kyu
Music Fun #1 - Major Scale
258
smokinhiro
Algorithms
Strings
Parsing
Logic
Fundamentals
Loading...
Confirm
Collect:
undefined
Loading collection data...