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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
Kebabize
12,869user4316848
Fundamentals
Strings
Regular Expressions
6 kyu
Sort the odd
108,336fyvfyv
Fundamentals
Arrays
Sorting
6 kyu
Your order, please
169,445iamstone
Strings
Fundamentals
6 kyu
Title Case
37,406user527539
Strings
Fundamentals
6 kyu
Data Reverse
24,390sataman
Arrays
Fundamentals
6 kyu
Highest Scoring Word
100,149PG1
Fundamentals
Strings
Arrays
6 kyu
Generic numeric template formatter
1,300GiacomoSorbi
Regular Expressions
Strings
Algorithms
6 kyu
Number Format
3,111cnawaraj
Regular Expressions
Fundamentals
Retired
Format a string of names like 'Bart, Lisa & Maggie'. (retired)
71,234weavermedia
Fundamentals
Strings
Data Types
Formatting
Algorithms
Logic
6 kyu
Unique In Order
184,758pinelopi
Algorithms
Fundamentals
6 kyu
Find the unique number
145,550isqua
Fundamentals
Algorithms
Arrays
Performance
6 kyu
Array.diff
285,040marcinbunsch
Arrays
Fundamentals
Algorithms
6 kyu
Persistent Bugger.
198,124joh_pot
Fundamentals
Mathematics
6 kyu
extract portion of file name
8,135Javatlacati
Regular Expressions
Fundamentals
5 kyu
Human Readable Time
143,324BattleRattle
Date Time
Mathematics
Algorithms
6 kyu
Sort two arrays
459myjinxin2015
Puzzles
Fundamentals
Sorting
Algorithms
Arrays
6 kyu
DefaultList
715beniolenio
Fundamentals
6 kyu
Break camelCase
119,642hakt
Strings
Fundamentals
6 kyu
IPv4 to int32
10,696sahglie
Networks
Algorithms
Bits
Binary
Fundamentals
6 kyu
Get root property name
438kodejuice
Data Structures
Fundamentals
6 kyu
Consecutive strings
79,529g964
Fundamentals
6 kyu
Prize Draw
6,996g964
Fundamentals
Strings
Sorting
6 kyu
Sorting by bits
9,280kodejuice
Logic
Arrays
Algorithms
Data Structures
Fundamentals
Bits
Binary
Sorting
6 kyu
Simple Simple Simple String Expansion
3,491alansun
Strings
Regular Expressions
Fundamentals
6 kyu
zipWith
6,736JohanWiltink
Lists
Arrays
Functional Programming
Algorithms
5 kyu
Count IP Addresses
28,525xDranik
Algorithms
5 kyu
Vector Class
856Detry322
Fundamentals
Object-oriented Programming
6 kyu
Vector Affinity
1,640keithhamilton
Data Structures
Algorithms
6 kyu
Coordinates Validator
6,899louy
Regular Expressions
Algorithms
5 kyu
Scramblies
55,228joh_pot
Strings
Performance
Algorithms
6 kyu
Sequence generator
817NaMe613
Fundamentals
6 kyu
Number Shortening Filter
944GiacomoSorbi
Angular
Algorithms
6 kyu
Find within array
3,523kylehill
Arrays
Functional Programming
Fundamentals
5 kyu
Convert A Hex String To RGB
15,055Krxtopher
Parsing
Strings
Algorithms
5 kyu
RGB To Hex Conversion
133,100jhoffner
Algorithms
6 kyu
Function Composition
13,517user578387
Functional Programming
Fundamentals
6 kyu
Calculate String Rotation
7,301obnounce
Strings
Arrays
Algorithms
5 kyu
Function Overloading for Types
89Kacarott
Decorator
Language Features
Metaprogramming
5 kyu
Self-closing Cookie Jar
210ecolban
Object-oriented Programming
Fundamentals
5 kyu
Lazy Repeater
7,488nklein
Iterators
Algorithms
5 kyu
Vector class
8,556eugene-bulkin
Object-oriented Programming
Algorithms
Linear Algebra
5 kyu
Land perimeter
4,865St3f4n
Fundamentals
5 kyu
A Chain adding function
28,613gelus
Mathematics
Functional Programming
Puzzles
5 kyu
Convert all the cases!
1,427AJFarmar
Strings
Regular Expressions
Algorithms
5 kyu
Function Addition
194wookie184
Fundamentals
6 kyu
Split Strings
156,975jhoffner
Regular Expressions
Strings
Algorithms
6 kyu
Count characters in your string
95,628riston
Strings
Fundamentals
6 kyu
Detect Pangram
183,185anindyabd
Strings
Data Structures
Fundamentals
6 kyu
Which filetypes are you using the most?
956ok-john
Fundamentals
Algorithms
Strings
Arrays
5 kyu
Limited number of instances
88FArekkusu
Object-oriented Programming
Metaprogramming
6 kyu
Schrödinger's Boolean
3,368docgunthrop
Language Features
Metaprogramming
Puzzles
6 kyu
Vowel Shifting
1,367user5036852
Strings
Regular Expressions
Algorithms
6 kyu
Shifted cycles
170eugene-katsevman
Iterators
Fundamentals
6 kyu
Get a User's Honor
326user2514386
Strings
Regular Expressions
Fundamentals
6 kyu
JSON Class Decorator
459SquishyStrawberry
Fundamentals
Object-oriented Programming
6 kyu
Determine the date by the day number
1,532LarisaOvchinnikova
Fundamentals
Date Time
Algorithms
5 kyu
Calculating with Functions
82,204BattleRattle
Functional Programming
6 kyu
Expected Type Decorator
486filipkonieczny
Fundamentals
Design Patterns
Object-oriented Programming
5 kyu
flatten()
4,466jhoffner
Arrays
Algorithms
5 kyu
Matching And Substituting
2,270g964
Fundamentals
5 kyu
Directory tree
89ecolban
Fundamentals
5 kyu
Return substring instance count - 2
3,024ineiti
Strings
Regular Expressions
Algorithms
5 kyu
Domain name validator
542Disassembler0
Regular Expressions
Strings
Fundamentals
5 kyu
Simple Events
5,747akoptsov
Design Patterns
Event Handling
Fundamentals
5 kyu
Street Fighter 2 - Character Selection - Part 2
1,982mmalkavian
Arrays
Lists
Fundamentals
Graph Theory
5 kyu
Binary search tree validation
950plastic
Trees
Recursion
Data Structures
Algorithms