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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.

Description

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1 kyu
Multi Line Task∞: Hello World
1,523Voile
Restricted
Puzzles
8 kyu
Never visit a . . . !?
20,080aryan-firouzian
Puzzles
Strings
Number Theory
Mathematics
6 kyu
The latest clock
2,684nirgn
Date Time
Fundamentals
Algorithms
5 kyu
Human Readable Time
144,312BattleRattle
Date Time
Mathematics
Algorithms
5 kyu
RGB To Hex Conversion
134,004jhoffner
Algorithms
4 kyu
Sum of Intervals
38,911xDranik
Algorithms
Performance
4 kyu
Sum by Factors
19,347g964
Arrays
Algorithms
Mathematics
4 kyu
Strings Mix
23,351g964
Fundamentals
Strings
4 kyu
Twice linear
23,135g964
Mathematics
Algorithms
4 kyu
Roman Numerals Helper
30,378jhoffner
Algorithms
Object-oriented Programming
6 kyu
Remove a Specific Element of an Array
781raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
5 kyu
Advanced Pig Latin
972davidbrear
Regular Expressions
Fundamentals
6 kyu
Simple Simple Simple String Expansion
3,539alansun
Strings
Regular Expressions
Fundamentals
6 kyu
Single Word Pig Latin
1,987MicheDev
Strings
Games
Regular Expressions
5 kyu
Greed is Good
57,467JulianNicholls
Algorithms
5 kyu
Square Matrix Multiplication
7,342xDranik
Matrix
Linear Algebra
Algorithms
5 kyu
Josephus Permutation
15,818GiacomoSorbi
Mathematics
Permutations
Algorithms
Combinatorics
5 kyu
Josephus Survivor
16,190GiacomoSorbi
Mathematics
Combinatorics
Algorithms
Lists
Arrays
6 kyu
Array.diff
287,124marcinbunsch
Arrays
Fundamentals
Algorithms
6 kyu
Bit Counting
244,428xcthulhu
Bits
Algorithms
6 kyu
I love big nums and I cannot lie
752joh_pot
Strings
Arrays
Algorithms
6 kyu
Selective Array Reversing
2,139kodejuice
Algorithms
Logic
Arrays
6 kyu
Count the smiley faces!
97,338St3f4n
Regular Expressions
Fundamentals
6 kyu
Mix Fruit Juice
1,097Heathercoraje
Fundamentals
Arrays
6 kyu
The Supermarket Queue
52,135mattlub
Arrays
Fundamentals
6 kyu
Parse HTML/CSS Colors
2,721junthecoder
Fundamentals
Algorithms
Strings
Parsing
4 kyu
Adding Big Numbers
32,554Becojo
Mathematics
Big Integers
Algorithms
4 kyu
Pyramid Slide Down
18,296rodentrabies
Algorithms
Dynamic Programming
4 kyu
Polygroup Mania
30dfhwze
Algorithms
Arrays
Recursion
Performance
4 kyu
Gymbro's Unique Gym - Weight Calculator
33Zanamo
Algorithms
Performance
Combinatorics
4 kyu
Bridge the Islands
67hexolio
Graph Theory
Performance
4 kyu
parseInt() reloaded
17,826BattleRattle
Parsing
Strings
Algorithms
3 kyu
Sudoku Solver
14,308pineappleclock
Games
Game Solvers
Algorithms
3 kyu
Make a spiral
14,761Bugari
Algorithms
Arrays
Logic
3 kyu
Rail Fence Cipher: Encoding and Decoding
8,692darrentburgess
Algorithms
Ciphers
Cryptography
Strings
Security
3 kyu
Alphabetic Anagrams
6,325Azuaron
Mathematics
Logic
Strings
Algorithms
3 kyu
Binomial Expansion
6,244TheDoctor
Mathematics
Algebra
Algorithms
3 kyu
The Lift
3,363dinglemouse
Algorithms
Queues
Data Structures
3 kyu
Defuse the bombs!
2,726Zyklus
Strings
Puzzles
Security
3 kyu
GET TO THE CHOPPA!
1,125sazlin
Games
Puzzles
Algorithms
Graph Theory
3 kyu
One Line Task: Check Range
1,540myjinxin2015
Puzzles
Restricted
3 kyu
Fabergé Easter Eggs crush test
1,824Ivana
Mathematics
Dynamic Programming
Performance
Algorithms
2 kyu
Evaluate mathematical expression
9,580ankr
Mathematics
Parsing
Algorithms
6 kyu
Duplicate Encoder
222,986obnounce
Strings
Arrays
Fundamentals