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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
12,840user4316848
Fundamentals
Strings
Regular Expressions
6 kyu
Sort the odd
107,860fyvfyv
Fundamentals
Arrays
Sorting
6 kyu
Your order, please
168,857iamstone
Strings
Fundamentals
6 kyu
Title Case
37,263user527539
Strings
Fundamentals
6 kyu
Data Reverse
24,237sataman
Arrays
Fundamentals
6 kyu
Highest Scoring Word
99,704PG1
Fundamentals
Strings
Arrays
6 kyu
Generic numeric template formatter
1,298GiacomoSorbi
Regular Expressions
Strings
Algorithms
6 kyu
Number Format
3,109cnawaraj
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
184,131pinelopi
Algorithms
Fundamentals
6 kyu
Find the unique number
145,001isqua
Fundamentals
Algorithms
Arrays
Performance
6 kyu
Array.diff
283,999marcinbunsch
Arrays
Fundamentals
Algorithms
6 kyu
Persistent Bugger.
197,512joh_pot
Fundamentals
Mathematics
6 kyu
extract portion of file name
8,121Javatlacati
Regular Expressions
Fundamentals
5 kyu
Human Readable Time
142,724BattleRattle
Date Time
Mathematics
Algorithms
6 kyu
Sort two arrays
458myjinxin2015
Puzzles
Fundamentals
Sorting
Algorithms
Arrays
6 kyu
DefaultList
714beniolenio
Fundamentals
6 kyu
Break camelCase
119,010hakt
Strings
Fundamentals
6 kyu
IPv4 to int32
10,681sahglie
Networks
Algorithms
Bits
Binary
Fundamentals
6 kyu
Get root property name
438kodejuice
Data Structures
Fundamentals
6 kyu
Consecutive strings
79,286g964
Fundamentals
6 kyu
Prize Draw
6,984g964
Fundamentals
Strings
Sorting
6 kyu
Sorting by bits
9,239kodejuice
Logic
Arrays
Algorithms
Data Structures
Fundamentals
Bits
Binary
Sorting
6 kyu
Simple Simple Simple String Expansion
3,479alansun
Strings
Regular Expressions
Fundamentals
6 kyu
zipWith
6,726JohanWiltink
Lists
Arrays
Functional Programming
Algorithms
5 kyu
Count IP Addresses
28,307xDranik
Algorithms
5 kyu
Vector Class
853Detry322
Fundamentals
Object-oriented Programming
6 kyu
Vector Affinity
1,637keithhamilton
Data Structures
Algorithms
6 kyu
Coordinates Validator
6,893louy
Regular Expressions
Algorithms
5 kyu
Scramblies
55,004joh_pot
Strings
Performance
Algorithms
6 kyu
Sequence generator
815NaMe613
Fundamentals
6 kyu
Number Shortening Filter
944GiacomoSorbi
Angular
Algorithms
6 kyu
Find within array
3,521kylehill
Arrays
Functional Programming
Fundamentals
5 kyu
Convert A Hex String To RGB
14,973Krxtopher
Parsing
Strings
Algorithms
5 kyu
RGB To Hex Conversion
132,636jhoffner
Algorithms
6 kyu
Function Composition
13,509user578387
Functional Programming
Fundamentals
6 kyu
Calculate String Rotation
7,294obnounce
Strings
Arrays
Algorithms
5 kyu
Function Overloading for Types
89Kacarott
Decorator
Language Features
Metaprogramming
5 kyu
Self-closing Cookie Jar
208ecolban
Object-oriented Programming
Fundamentals
5 kyu
Lazy Repeater
7,464nklein
Iterators
Algorithms
5 kyu
Vector class
8,535eugene-bulkin
Object-oriented Programming
Algorithms
Linear Algebra
5 kyu
Land perimeter
4,822St3f4n
Fundamentals
5 kyu
A Chain adding function
28,571gelus
Mathematics
Functional Programming
Puzzles
5 kyu
Convert all the cases!
1,426AJFarmar
Strings
Regular Expressions
Algorithms
5 kyu
Function Addition
194wookie184
Fundamentals
6 kyu
Split Strings
156,276jhoffner
Regular Expressions
Strings
Algorithms
6 kyu
Count characters in your string
95,085riston
Strings
Fundamentals
6 kyu
Detect Pangram
182,381anindyabd
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
86FArekkusu
Object-oriented Programming
Metaprogramming
6 kyu
Schrödinger's Boolean
3,362docgunthrop
Language Features
Metaprogramming
Puzzles
6 kyu
Vowel Shifting
1,366user5036852
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
454SquishyStrawberry
Fundamentals
Object-oriented Programming
6 kyu
Determine the date by the day number
1,528LarisaOvchinnikova
Fundamentals
Date Time
Algorithms
5 kyu
Calculating with Functions
81,913BattleRattle
Functional Programming
6 kyu
Expected Type Decorator
479filipkonieczny
Fundamentals
Design Patterns
Object-oriented Programming
5 kyu
flatten()
4,451jhoffner
Arrays
Algorithms
5 kyu
Matching And Substituting
2,266g964
Fundamentals
5 kyu
Directory tree
89ecolban
Fundamentals
5 kyu
Return substring instance count - 2
3,019ineiti
Strings
Regular Expressions
Algorithms
5 kyu
Domain name validator
541Disassembler0
Regular Expressions
Strings
Fundamentals
5 kyu
Simple Events
5,742akoptsov
Design Patterns
Event Handling
Fundamentals
5 kyu
Street Fighter 2 - Character Selection - Part 2
1,981mmalkavian
Arrays
Lists
Fundamentals
Graph Theory
5 kyu
Binary search tree validation
950plastic
Trees
Recursion
Data Structures
Algorithms