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Train Now

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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5 kyu
RGB To Hex Conversion
123,186jhoffner
Algorithms
4 kyu
Twice linear
21,608g964
Mathematics
Algorithms
6 kyu
Playing with digits
130,582g964
Fundamentals
Mathematics
4 kyu
Roman Numerals Helper
27,224jhoffner
Algorithms
Object-oriented Programming
5 kyu
Is my friend cheating?
16,868g964
Fundamentals
Mathematics
Puzzles
4 kyu
Hamming Numbers
10,900xcthulhu
Number Theory
Algorithms
4 kyu
Codewars style ranking system
15,789jhoffner
Algorithms
Object-oriented Programming
4 kyu
Functional streams
722muesli4
Streams
Functional Programming
Algorithms
4 kyu
The Greatest Warrior
3,281BurstNova
Algorithms
Object-oriented Programming
5 kyu
Rot13
86,102Rubikan
Ciphers
Fundamentals
5 kyu
Moving Zeros To The End
166,055xcthulhu
Arrays
Sorting
Algorithms
4 kyu
Find the unknown digit
7,720JJ-Bug
Mathematics
Algorithms
Puzzles
5 kyu
Calculating with Functions
76,654BattleRattle
Functional Programming
4 kyu
parseInt() reloaded
16,258BattleRattle
Parsing
Strings
Algorithms
5 kyu
Simple Events
5,644akoptsov
Design Patterns
Event Handling
Fundamentals
1 kyu
Functional SQL
2,651surtich
Functional Programming
Algorithms
4 kyu
Sum Strings as Numbers
40,518nicknovitski
Strings
Big Integers
Algorithms
5 kyu
Pick peaks
26,911frenetic_be
Arrays
Algorithms
4 kyu
Sum of Intervals
36,055xDranik
Algorithms
Performance
4 kyu
Determining if a graph has a solution
1,454damned3
Algorithms
Data Structures
Graph Theory
Retired
Calculator (retired)
11,547obrok
Algorithms
Parsing
Logic
Strings
Expressions
Basic Language Features
Fundamentals
5 kyu
Josephus Survivor
15,097GiacomoSorbi
Mathematics
Combinatorics
Algorithms
Lists
Arrays
5 kyu
Write out numbers
3,310frenetic_be
Fundamentals
5 kyu
Molecule to atoms
5,716romanzes
Parsing
Algorithms
Strings
5 kyu
Josephus Permutation
14,752GiacomoSorbi
Mathematics
Permutations
Algorithms
Combinatorics
4 kyu
Born to be chained
1,164surtich
Functional Programming
3 kyu
The Lift
3,107dinglemouse
Algorithms
Queues
Data Structures
6 kyu
Backspaces in string
17,491vetalpaprotsky
Fundamentals
Strings
Algorithms
5 kyu
Sweeping trees
74hyperion
Trees
Algorithms
Graph Theory
3 kyu
Alphametics Solver
398docgunthrop
Puzzles
Performance
Cryptography
Algorithms
4 kyu
So Many Permutations!
44,576BattleRattle
Permutations
Strings
Algorithms
6 kyu
Spiral Column Addition
62phildinius
Mathematics
Algorithms
Puzzles
5 kyu
Decorator Pattern
394surtich
Design Patterns
Decorator
Object-oriented Programming
Fundamentals
4 kyu
ES5 Generators(i)
1,076surtich
Functional Programming
Fundamentals
6 kyu
Hexagon Beam Max Sum
302docgunthrop
Puzzles
Arrays
Algorithms
4 kyu
Strings Mix
22,131g964
Fundamentals
Strings
4 kyu
Breadcrumb Generator
4,394GiacomoSorbi
Parsing
Regular Expressions
Algorithms
6 kyu
Meeting
19,465g964
Fundamentals
6 kyu
Crack the PIN
2,779zLuki
Algorithms
Cryptography
4 kyu
Adding Big Numbers
30,076Becojo
Mathematics
Big Integers
Algorithms
4 kyu
Strip Comments
49,741jhoffner
Strings
Algorithms
5 kyu
Gap in Primes
19,953g964
Fundamentals
4 kyu
Can you really count divisors?
445kabaczek83
Algorithms
Mathematics
4 kyu
Sum by Factors
18,329g964
Arrays
Algorithms
Mathematics
4 kyu
Large Factorials
8,677matt c
Algorithms
Big Integers
3 kyu
Binomial Expansion
5,534TheDoctor
Mathematics
Algebra
Algorithms
6 kyu
Which are in?
76,252g964
Arrays
Lists
Strings
Refactoring
5 kyu
Play with two Strings
3,363smile67
Fundamentals
Strings
Algorithms
5 kyu
Integers: Recreation One
25,050g964
Fundamentals
Algorithms
4 kyu
Counter: Pythonize your Java!! (VERBOSE)
52Blind4Basics
Object-oriented Programming
Fundamentals