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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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4 kyu
So Many Permutations!
47,822BattleRattle
Permutations
Strings
Algorithms
6 kyu
Convert string to camel case
193,972jhoffner
Regular Expressions
Algorithms
Strings
4 kyu
Most frequently used words in a text
28,270markprzepiora
Strings
Filtering
Algorithms
Regular Expressions
4 kyu
Strings Mix
23,348g964
Fundamentals
Strings
5 kyu
RGB To Hex Conversion
133,978jhoffner
Algorithms
4 kyu
Sum of Intervals
38,902xDranik
Algorithms
Performance
6 kyu
Is a number prime?
113,045arithmetric
Mathematics
Algorithms
6 kyu
Array.diff
287,071marcinbunsch
Arrays
Fundamentals
Algorithms
4 kyu
Human readable duration format
83,263davazp
Strings
Date Time
Algorithms
4 kyu
Adding Big Numbers
32,548Becojo
Mathematics
Big Integers
Algorithms
4 kyu
Roman Numerals Helper
30,365jhoffner
Algorithms
Object-oriented Programming
4 kyu
Priori Incantatem
216dcsmith
Object-oriented Programming
Metaprogramming
Reflection
6 kyu
Image host filename generator
6,369int3_0xcc
Logic
Object-oriented Programming
Strings
Fundamentals
5 kyu
String incrementer
49,208parceval
Regular Expressions
Strings