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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
Zeros and Ones
788kodejuice
Puzzles
Logic
Algorithms
6 kyu
Convert string to camel case
191,240jhoffner
Regular Expressions
Algorithms
Strings
5 kyu
Primes in numbers
29,368g964
Fundamentals
Mathematics
5 kyu
Can you get the loop ?
28,354Devouring
Algorithms
Linked Lists
Performance
5 kyu
Human Readable Time
142,366BattleRattle
Date Time
Mathematics
Algorithms
5 kyu
Josephus Permutation
15,537GiacomoSorbi
Mathematics
Permutations
Algorithms
Combinatorics
3 kyu
Make a spiral
14,573Bugari
Algorithms
Arrays
Logic
3 kyu
Esolang Interpreters #4 - Boolfuck Interpreter
1,987donaldsebleung
Esoteric Languages
Interpreters
Algorithms
Tutorials
4 kyu
Boggle Word Checker
3,557evan-eleven
Arrays
Recursion
Puzzles
4 kyu
How many numbers III?
3,952raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
4 kyu
Advanced Events
1,544akoptsov
Design Patterns
Event Handling
4 kyu
Dependency Injection
4,216kesheshyan
Regular Expressions
Design Patterns
Object-oriented Programming
Angular
4 kyu
Vigenère Cipher Helper
8,225jacobb
Algorithms
Ciphers
Security
Object-oriented Programming
Strings
5 kyu
Haskell List Dot Notation
472surtich
Functional Programming
Arrays
Algorithms
6 kyu
Unary function chainer
6,991tpatja
Functional Programming
Fundamentals
Retired
IQ Test (retired)
83,595AlexIsHappy
Fundamentals
Logic
6 kyu
Give me a Diamond
36,429jayeshcp
Strings
ASCII Art
Fundamentals
5 kyu
Rot13
91,404Rubikan
Ciphers
Fundamentals
6 kyu
Fibonacci, Tribonacci and friends
13,218GiacomoSorbi
Arrays
Lists
Number Theory
Fundamentals
6 kyu
String Evaluation
483sataman
Strings
Algorithms
6 kyu
Longest alphabetical substring
3,092Avanta
Fundamentals
Strings
7 kyu
Complementary DNA
222,773JustyFY
Strings
Fundamentals
7 kyu
Credit Card Mask
187,992samranjbari
Strings
Algorithms
7 kyu
Isograms
253,175chunjef
Strings
Fundamentals
7 kyu
Mumbling
228,523g964
Fundamentals
Strings
Puzzles
7 kyu
Vowel Count
413,576jayeshcp
Strings
Fundamentals
7 kyu
Highest and Lowest
297,085Deantwo
Fundamentals
Strings
8 kyu
Lexical this
2,753matt c
Fundamentals
8 kyu
Playing with cubes II
7,731Jotha
Fundamentals
Object-oriented Programming
5 kyu
Simple Pig Latin
162,410user2505876
Regular Expressions
Algorithms
5 kyu
Moving Zeros To The End
178,770xcthulhu
Arrays
Sorting
Algorithms
5 kyu
RGB To Hex Conversion
132,266jhoffner
Algorithms
6 kyu
Help the bookseller !
28,724g964
Fundamentals
Algorithms
6 kyu
Tribonacci Sequence
153,437GiacomoSorbi
Number Theory
Arrays
Lists
Fundamentals
6 kyu
The Supermarket Queue
51,273mattlub
Arrays
Fundamentals
6 kyu
Multiples of 3 or 5
423,076jhoffner
Mathematics
Algorithms
6 kyu
Split Strings
155,923jhoffner
Regular Expressions
Strings
Algorithms
6 kyu
Highest Scoring Word
99,485PG1
Fundamentals
Strings
Arrays
6 kyu
Build Tower
100,3458fdafs2
Strings
ASCII Art
Fundamentals
6 kyu
Which are in?
79,525g964
Arrays
Lists
Strings
Refactoring
6 kyu
Break camelCase
118,630hakt
Strings
Fundamentals
Retired
Character Frequency (retired)
6,074MysteriousMagenta
Fundamentals
Strings
8 kyu
Drink about
47,642darlanmendonca
Fundamentals
8 kyu
Triple Trouble
19,855G0ldenSp00n
Puzzles
8 kyu
Total amount of points
109,183petrosernivka
Fundamentals
Arrays
Strings
8 kyu
A wolf in sheep's clothing
35,152jkempster34
Fundamentals
Arrays
7 kyu
Check the exam
31,072Dmitry Kudla
Fundamentals
Arrays
7 kyu
Are the numbers in order?
28,814donaldsebleung
Fundamentals
Mathematics
Algorithms
8 kyu
Collatz Conjecture (3n+1)
14,197Goncalerta
Fundamentals
Algorithms
Mathematics
8 kyu
Is this my tail?
27,222PG1
Debugging
8 kyu
A Strange Trip to the Market
15,197sergarrick
Regular Expressions
Strings
Fundamentals
8 kyu
Who is going to pay for the wall?
14,424mamafrantz
Fundamentals
Strings
8 kyu
Capitalization and Mutability
39,398kolohelios
Strings
Debugging
5 kyu
Caesar Cipher Helper
4,884eugene-bulkin
Ciphers
Object-oriented Programming
Strings
Algorithms
5 kyu
PaginationHelper
39,842jhoffner
Object-oriented Programming
Arrays
Algorithms
5 kyu
Lazy Repeater
7,446nklein
Iterators
Algorithms
5 kyu
Vector class
8,518eugene-bulkin
Object-oriented Programming
Algorithms
Linear Algebra
5 kyu
Simple Events
5,740akoptsov
Design Patterns
Event Handling
Fundamentals
8 kyu
Bin to Decimal
31,887wichu
Binary
Fundamentals
8 kyu
Sum of positive
309,479JbPasquier
Arrays
Fundamentals
8 kyu
CSV representation of array
18,863Dmitry Kudla
Fundamentals
Arrays
Strings
8 kyu
String cleaning
25,486mkelty
Regular Expressions
Fundamentals
Strings
Retired
Man in the west (retired)
7,971vaca_gare
Fundamentals
8 kyu
Return Negative
343,490Deantwo
Fundamentals
8 kyu
Array plus array
86,067Dmitry Kudla
Fundamentals
Arrays
Debugging
8 kyu
Even or Odd
525,097suuuzi
Mathematics
Fundamentals
8 kyu
Do you speak "English"?
17,693tyeung2017
Fundamentals
8 kyu
ASCII Total
13,024user3220651
Fundamentals
8 kyu
Find the Remainder
26,939constablebrew
Mathematics
Fundamentals
Draft
A function within a function
13,610amrdraz
Status:Draft
Estimated Rank:
7 kyu
Fundamentals
8 kyu
Calculate average
160,982wichu
Fundamentals
Arrays
6 kyu
Counting Duplicates
229,496kgashok
Strings
Fundamentals
6 kyu
Parse HTML/CSS Colors
2,699junthecoder
Fundamentals
Algorithms
Strings
Parsing
5 kyu
Regex Password Validation
28,346EricFreeman
Regular Expressions
Fundamentals