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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
Transformation iteration
255joh_pot
Strings
Fundamentals
7 kyu
Sum of odd numbers
165,812hhelwich
Arrays
Lists
Mathematics
Fundamentals
4 kyu
Lambda term reduction
61hhelwich
Mathematics
Logic
Functional Programming
Algorithms
Trees
Retired
nPascal (retired)
127user8868275
Status:Retired
Recursion
Algorithms
6 kyu
Alternating Loops
1,381joh_pot
Fundamentals
Algorithms
8 kyu
validate code with simple regex
13,858daymos
Regular Expressions
Fundamentals
Retired
The Office VII - Expression of Interest (retired)
138PG1
Status:Retired
Estimated Rank:
7 kyu
Fundamentals
Strings
Arrays
7 kyu
The Lazy Startup Office
2,015Cleop
Arrays
Matrix
Fundamentals
Retired
Working from Home - Lunchtime Beer (retired)
26PG1
Status:Retired
Estimated Rank:
7 kyu
Mathematics
Fundamentals
8 kyu
Regexp Basics - is it a digit?
16,373taw
Regular Expressions
Fundamentals
6 kyu
Help Suzuki purchase his Tofu!
846user8476848
Algorithms
Data Structures
Fundamentals
8 kyu
Arguments to Binary addition
3,335Javatlacati
Arrays
Binary
Fundamentals
7 kyu
DNA GC-content
790nbeck
Strings
Algorithms
8 kyu
Count words
7,723HighQuality
Fundamentals
Strings
8 kyu
Triple Trouble
20,131G0ldenSp00n
Puzzles
Draft
Working with arithmetic progressions
5raulbc777
Status:Draft
Estimated Rank:
6 kyu
Fundamentals
Mathematics
7 kyu
Arithmetic List!
5,087zenAndroid
Arrays
Fundamentals
Beta
Vanity Plates
39Nmistrata
Status:Waiting for issues to be resolved
Estimated Rank:
6 kyu
Strings
Algorithms
7 kyu
Password maker
5,678ChavXO
Strings
Regular Expressions
Fundamentals
Beta
Calculate the required interest rate
66AartiK1
Status:Testing & feedback needed
Estimated Rank:
7 kyu
Fundamentals
5 kyu
Calculate the expression
213GotThat
Mathematics
Strings
Algorithms
Beta
Calculation of the Angles of a Triangle
54raulbc777
Status:Waiting for issues to be resolved
Estimated Rank:
7 kyu
Fundamentals
Mathematics
7 kyu
Composing squared strings
2,612g964
Fundamentals
7 kyu
Scaling Squared Strings
5,698g964
Fundamentals
Strings
7 kyu
Training JS #40: Regular Expression--"|", "[]" and "()"
1,216myjinxin2015
Fundamentals
Regular Expressions
Tutorials
5 kyu
Sort - one, three, two
2,199dinglemouse
Sorting
Strings
Algorithms
6 kyu
Area of a Shape
383user6270586
Statistics
Algorithms
7 kyu
Find the divisors!
87,995kwy95
Mathematics
Algorithms
Retired
Squash the bugs (retired)
24,553PG1
Debugging
Fundamentals
8 kyu
Name on billboard
19,318val_alex
Fundamentals
Restricted
Strings
Retired
Phone Number (retired)
50Lusina
Status:Retired
Estimated Rank:
6 kyu
Regular Expressions
Strings
Algorithms
6 kyu
Santa's Missing Gift List
456omegahm
Binary
Algorithms
6 kyu
Prize Draw
7,063g964
Fundamentals
Strings
Sorting
7 kyu
Mirroring cipher
715user8580805
Strings
Cryptography
Security
Algorithms
Beta
Implement "The Match" to assign med school graduates to hospitals
7SteveRuble
Status:Testing & feedback needed
Estimated Rank:
4 kyu
Algorithms
7 kyu
Paperboy
869TroyMaeder
Algorithms
Draft
Count the likes
726oli5679
Status:Draft
Estimated Rank:
8 kyu
Strings
Arrays
Algorithms
6 kyu
One down
1,009WesleyYoung
Strings
Algorithms
Cryptography
Puzzles
Draft
Amazon Interview: Find Interval Lengths
5ericswenson15
Status:Draft
Estimated Rank:
5 kyu
Data Structures
Algorithms
7 kyu
Speed Control
15,836g964
Fundamentals
Mathematics
7 kyu
'x' marks the spot.
2,208user4386369
Fundamentals
Arrays
Matrix
Draft
Array of array products
5brassington
Status:Draft
Estimated Rank:
7 kyu
7 kyu
Magic Three
285Z-Bone
Fundamentals
Algorithms
6 kyu
intToBits(int, length)
181wthit56
Bits
Fundamentals
6 kyu
Construct Graph Class (simple)
315Joz
Object-oriented Programming
Fundamentals
Graph Theory
6 kyu
Simplify the number!
978iamchingel
Fundamentals
7 kyu
Sorting the Odd way!
1,365iamchingel
Fundamentals
Arrays
Sorting
5 kyu
The Wrong-Way Cow
521dinglemouse
Arrays
Algorithms
6 kyu
Sort the odd
109,008fyvfyv
Fundamentals
Arrays
Sorting
Retired
easy peasy - smallest input (retired)
17Tefferson
Status:Retired
Estimated Rank:
5 kyu
Puzzles
Algorithms
Mathematics
Restricted
6 kyu
The Union Jack
194otajor
Strings
ASCII Art
Fundamentals
7 kyu
Sorted Union
1,619GiacomoSorbi
Arrays
Lists
Algorithms
Sorting
6 kyu
Braking well
3,073g964
Fundamentals
Mathematics
6 kyu
Single Word Pig Latin
1,986MicheDev
Strings
Games
Regular Expressions
Beta
Temp Tracker: Max, Min, Mean and Mode
377interviewcake
Status:Waiting for issues to be resolved
Estimated Rank:
5 kyu
Fundamentals
5 kyu
Primes with Even Digits
889raulbc777
Strings
Data Structures
Algorithms
Mathematics
Number Theory
6 kyu
Change it up
2,685aec58
Strings
Fundamentals
7 kyu
Noonerize Me
1,491webtechalex
Mathematics
Arrays
Algorithms
8 kyu
Wilson primes
12,160huzeifa
Mathematics
Fundamentals
Draft
Simple Fun #58: Are Isomorphic?
6myjinxin2015
Status:Draft
Estimated Rank:
6 kyu
Puzzles
Draft
Sieve of Eratosthenes
50ArcaneIntegers
Status:Draft
Estimated Rank:
6 kyu
Mathematics
Algorithms
Fundamentals
6 kyu
Sum of many ints
2,916farzher
Mathematics
Algorithms
7 kyu
All, None & Any
3,189myTerminal
Arrays
Fundamentals
Retired
Some First Primes With Two Digits (retired)
25A D L Σ R
Status:Retired
Estimated Rank:
7 kyu
Fundamentals
Mathematics
6 kyu
Pascal's Triangle
11,601boatmeme
Arrays
Mathematics
Algorithms
7 kyu
Tea for two
2,817ransy
Fundamentals
Strings
Beta
OCR Numbers
23Lusina
Status:Waiting for issues to be resolved
Estimated Rank:
4 kyu
Algorithms
Puzzles
6 kyu
Tank Truck
4,879g964
Mathematics
Geometry
6 kyu
The Desperate Rocket Scientist
1,145Cito
Arrays
Puzzles
6 kyu
Round by 0.5 steps
4,278vshjxyz
Mathematics
Fundamentals