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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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Ad
6 kyu
Minimum dollar bill's count
164jteodoro
Fundamentals
Arrays
Algorithms
6 kyu
Change Machine
385Lordnibbler
Algorithms
Performance
Retired
Christmas Day (retired)
1,140fizis
Date Time
Fundamentals
7 kyu
Authenticate a list of usernames
586PiotrBerebecki
Strings
Regular Expressions
Arrays
Data Structures
Algorithms
6 kyu
TGI Friday!!
943papuarza
Date Time
6 kyu
Custom sort function
1,195lunitik
Sorting
Arrays
Algorithms
Restricted
7 kyu
Sorting Arrays ... wait, what?!
445donaldsebleung
Algorithms
Logic
Object-oriented Programming
Sorting
5 kyu
Array.diff hero
679Iprit
Arrays
Fundamentals
7 kyu
Find the Combination
436hfliu
Fundamentals
Strings
Regular Expressions
5 kyu
Not Quine
335_nderscore
Algorithms
4 kyu
Default Arguments
1,312xcthulhu
Functional Programming
Metaprogramming
6 kyu
Javascript filter - 3
2,005ineiti
Regular Expressions
Arrays
Fundamentals
5 kyu
Sorted list
380osuushi
Algorithms
Arrays
Performance
Object-oriented Programming
Sorting
6 kyu
Count word occurrences
249Uraza
Strings
Algorithms
6 kyu
Once
5,769osuushi
Functional Programming
Fundamentals
6 kyu
Shortest code: Bug in Apple
464myjinxin2015
Puzzles
Games
Restricted
6 kyu
100 prisoners, 100 drawers, 100 paper slips
48donaldsebleung
Puzzles
Mathematics
Probability
Logic
6 kyu
Probability 101
92valerio_c
Probability
Mathematics
Fundamentals
6 kyu
Fun with lists: filter
1,089janitormeir
Lists
Functional Programming
Fundamentals
6 kyu
Fun with lists: map
1,609janitormeir
Lists
Functional Programming
Fundamentals
6 kyu
Fun with lists: reduce
1,040janitormeir
Lists
Functional Programming
Fundamentals
6 kyu
Numerology
2,202user4806669
Date Time
Fundamentals
6 kyu
Coding Meetup #10 - Higher-Order Functions Series - Create usernames
3,173PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
6 kyu
Coding Meetup #16 - Higher-Order Functions Series - Ask for missing details
2,326PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
6 kyu
The Non-Discriminate Factorial
990SamTay
Mathematics
Fundamentals
6 kyu
Validate my Password
3,580Capocaccia
Regular Expressions
Fundamentals
6 kyu
Fun with trees: max sum
3,760janitormeir
Trees
Recursion
Binary Trees
Binary Search Trees
Data Structures
Algorithms
5 kyu
Maximum Contiguous Sum
769thibaultCha
Arrays
Algorithms
6 kyu
Trim a String
2,358BattleRattle
Strings
Regular Expressions
Fundamentals
6 kyu
Find the unique number
1,700kayahr
Arrays
Performance
Fundamentals
5 kyu
Partition On
6,312jcorbin@wunjo.org
Functional Programming
Arrays
Algorithms
5 kyu
Prime Numbers
1,480user3765829
Algorithms
6 kyu
Sum The Tree
4,513jz9000
Trees
Recursion
Binary Trees
Binary Search Trees
Data Structures
Fundamentals
5 kyu
7-segment converter
645wthit56
Binary
Bits
Fundamentals
5 kyu
Fun with trees: array to tree
3,100janitormeir
Trees
Arrays
Binary Trees
Data Structures
Algorithms
5 kyu
Bit calculator
1,999riomus
Bits
Mathematics
Algorithms
6 kyu
Function composition
8,802matthewglover
Functional Programming
Fundamentals
6 kyu
Island Count
236finetype
Puzzles
5 kyu
Missing and Duplicate Number
196Uraza
Arrays
Algorithms
5 kyu
Advanced Pig Latin
941davidbrear
Regular Expressions
Fundamentals
6 kyu
Reverse linked list
1,118vgrichina
Algorithms
Lists
Data Structures
6 kyu
The Most Sacred of Days
448laoris
Date Time
Algorithms
5 kyu
#Hashtag
1,110barakyo
Strings
Regular Expressions
Algorithms
6 kyu
Santa's Master Plan
944xDranik
Arrays
Filtering
Algorithms
5 kyu
Vending Machines
514xcthulhu
Puzzles
Algorithms
6 kyu
Array Helpers
22,079BattleRattle
Arrays
Fundamentals
Object-oriented Programming
5 kyu
Word Finder
1,856BattleRattle
Strings
Regular Expressions
Filtering
Algorithms
5 kyu
Simple Linear Regression Cost Function (Machine Learning)
288Ban-Ath
Machine Learning
Algorithms
Mathematics
Data Science
6 kyu
None shall pass
1,336adriaanbaelus
Security
Puzzles
5 kyu
Fibonacci Generator
852x-way
Mathematics
Algorithms
5 kyu
Compose functions (T Combinator)
2,226kylehill
Functional Programming
Fundamentals
5 kyu
Object extend
1,486kylehill
Arrays
Fundamentals
6 kyu
Simple Fun #254: Factorized GCD
101myjinxin2015
Fundamentals
Mathematics
7 kyu
Greed
720rememberchicken
Regular Expressions
Debugging