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Start training on this collection. Each time you skip or complete a kata you will be taken to the next kata in the series. Once you cycle through the items in the collection you will revert back to your normal training routine.

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6 kyu
Don't rely on luck.
12,268JoshBrodieNZ
Games
Puzzles
7 kyu
Echo
381OpenByte
Puzzles
Strings
Games
Draft
Return 2019 but without numbers or letters!
63Whimpers
Status:Draft
Estimated Rank:
4 kyu
7 kyu
Stop the loop after n seconds
521jamad
Date Time
Debugging
7 kyu
Password Hashes
4,794user5854572
Security
Fundamentals
Beta
Create a password hashing function.
37int3_0xcc
Status:Awaiting approval
Estimated Rank:
4 kyu
Cryptography
Security
Mathematics
Algorithms
6 kyu
Hex to base64
363e.mihaylin
Strings
Algorithms
5 kyu
A Chain adding function
29,196gelus
Mathematics
Functional Programming
Puzzles
8 kyu
Yield to the Block
2,782agram
Functional Programming
Fundamentals
5 kyu
Calculating with Functions
85,205BattleRattle
Functional Programming
6 kyu
Schrödinger's Boolean
3,432docgunthrop
Language Features
Metaprogramming
Puzzles
6 kyu
The Desperate Rocket Scientist
1,160Cito
Arrays
Puzzles
4 kyu
Method Lockdown
913JoshBrodieNZ
Metaprogramming
6 kyu
Mnemonic Lookup
98AniaMakes
Fundamentals
6 kyu
None shall pass
1,353adriaanbaelus
Security
Puzzles
8 kyu
Not so black box
3,067g-sam
Puzzles
5 kyu
Pipelining and composing functions
530user5363957
Functional Programming
Fundamentals
5 kyu
Concatenating functions
2,045scheffield
Functional Programming
Fundamentals
6 kyu
hidden key
128matt c
Fundamentals
5 kyu
Simple Time Bomb
2,376constablebrew
Reverse Engineering
Games
Puzzles
6 kyu
sum function
601skibinska
Fundamentals
5 kyu
Javascript Magic Function
540candrabeqx
Language Features
Functional Programming
8 kyu
Generate user links
4,309matt c
Puzzles
7 kyu
First-Class Function Factory
7,574otajor
Fundamentals
Functional Programming
Arrays
7 kyu
Get the 𝑟𝑒𝑎𝑙 length of a string
290binggg
Unicode
Strings
Language Features
8 kyu
!a == a ?!
3,045arhigod
Fundamentals
Language Features
7 kyu
Quine
200gkucmierz
Puzzles
Retired
Find a way to cheat the Codewars testing system (retired)
15tianshuo
Status:Retired
Estimated Rank:
1 kyu
Puzzles
Security
Bugs
Retired
Say "Hello World" JS Style and say even more! (retired)
24pzurowski
Status:Retired
Estimated Rank:
4 kyu
Fundamentals
Functions
Control Flow
Basic Language Features
Advanced Language Features
Retired
Convert Symbol to Array (retired)
88GeorgeSeeger
Status:Retired
Estimated Rank:
7 kyu
Arrays
Fundamentals
Retired
Know your language inner workings (retired)
11pocesar
Status:Retired
Estimated Rank:
6 kyu
Fundamentals
Numbers
Data Types
Retired
Easy virtue (retired)
7maximblack
Status:Retired
Estimated Rank:
4 kyu
Puzzles
Retired
May a == 1 && a == 2 && a == 3 (retired)
6Anonymous-Qsh
Status:Retired
Estimated Rank:
8 kyu
Fundamentals
Retired
JavaScript Wizardry (retired)
6ThibaultCarmantrand
Status:Retired
Estimated Rank:
6 kyu
Fundamentals
Retired
Equal or Not Equal: that is the question! (retired)
5AndrasG
Status:Retired
Estimated Rank:
4 kyu
Puzzles
Retired
Finicky Integers #1 (retired)
5funnbot
Status:Retired
Estimated Rank:
6 kyu
Puzzles
Numbers
Data Types
Integers
Games
7 kyu
Strict Mode
476trashy_incel
Language Features
6 kyu
Spread number
256linisnie
Fundamentals
5 kyu
Compose functions (T Combinator)
2,284kylehill
Functional Programming
Fundamentals
5 kyu
Not Quine
343_nderscore
Algorithms
6 kyu
Array.isArray
678abednego
Arrays
Algorithms
6 kyu
Once
6,172osuushi
Functional Programming
Fundamentals
6 kyu
Combinator Flip
3,650JTipp
Functional Programming
Fundamentals
6 kyu
multiFilter
2,937gperales
Functional Programming
Fundamentals
5 kyu
Lazy evaluation
1,798surtich
Functional Programming
5 kyu
Lazy Chain
255dfrown123
Functional Programming
Fundamentals
7 kyu
Run your String
1,564VoodooLab
Strings
Fundamentals
7 kyu
Number-like counter
2,273osuushi
Fundamentals
Object-oriented Programming
6 kyu
"Stringing"+"Me"+"Along"
6,906shinchy
Functional Programming
Fundamentals
6 kyu
Function Composition
13,840user578387
Functional Programming
Fundamentals
6 kyu
Unary function chainer
7,227tpatja
Functional Programming
Fundamentals
5 kyu
Replicate `new`
7,209glebec
Object-oriented Programming
Fundamentals
5 kyu
Simple Events
5,832akoptsov
Design Patterns
Event Handling
Fundamentals
4 kyu
Dependency Injection
4,307kesheshyan
Regular Expressions
Design Patterns
Object-oriented Programming
Angular
Beta
Run n times
30bellentuck
Status:Waiting for issues to be resolved
Estimated Rank:
7 kyu
Fundamentals
6 kyu
Bag#every?
757saterus
Functional Programming
Fundamentals
6 kyu
Metaprogramming Conjurer
579Lordnibbler
Metaprogramming
Fundamentals
5 kyu
Phone my kids
1,157ineiti
Metaprogramming
Object-oriented Programming
Fundamentals
Beta
Quine function (code golf)
24оkabe
Status:Waiting for issues to be resolved
Estimated Rank:
6 kyu
Restricted
Puzzles
6 kyu
Equal and opposite
527skeate
Fundamentals
5 kyu
Base64 Encoding
5,228joseph.varnado
Binary
Strings
Algorithms