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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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7 kyu
Sorting the Odd way!
1,284iamchingel
Fundamentals
Arrays
Sorting
6 kyu
Custom sort function
1,194lunitik
Sorting
Arrays
Algorithms
Restricted
5 kyu
Sorted list
380osuushi
Algorithms
Arrays
Performance
Object-oriented Programming
Sorting
6 kyu
Sort the odd
99,610fyvfyv
Fundamentals
Arrays
Sorting
6 kyu
Sum The Tree
4,512jz9000
Trees
Recursion
Binary Trees
Binary Search Trees
Data Structures
Fundamentals
6 kyu
Inside Out Strings
1,832PG1
Fundamentals
Strings
Arrays
7 kyu
Get length of the list recursively
1,377wichu
Fundamentals
Functional Programming
6 kyu
Javascript filter - 3
2,005ineiti
Regular Expressions
Arrays
Fundamentals
5 kyu
How Many Numbers? II
1,299raulbc777
Algorithms
Data Structures
Mathematics
Fundamentals
5 kyu
Find the smallest
4,936g964
Fundamentals
6 kyu
Braking well
3,010g964
Fundamentals
Mathematics
4 kyu
Snail
70,990stevenbarragan
Arrays
Algorithms
6 kyu
Coordinates Validator
6,805louy
Regular Expressions
Algorithms
8 kyu
Stringy Strings
36,495andrewMacmurray
Strings
Binary
Algorithms
6 kyu
Equal Sides Of An Array
119,050Shivo
Algorithms
Arrays
Fundamentals
6 kyu
Roof Replacement
356PG1
Fundamentals
Strings
Arrays
5 kyu
SQL Basics: Group By Day
7,070jhoffner
SQL
Fundamentals
6 kyu
Give me DST !!!
125nrgarg
Date Time
Fundamentals
6 kyu
Functional Lists
1,025nklein
Functional Programming
Lists
Data Structures
Algorithms
6 kyu
Recursive Averages
291joh_pot
Algorithms
7 kyu
Equalize the array!
1,093iamchingel
Fundamentals
Puzzles
Arrays
7 kyu
Averages of numbers
10,143user5036852
Fundamentals
Logic
Algorithms
4 kyu
Born to be chained
1,164surtich
Functional Programming
6 kyu
Find a Bunch of Common Elements of Two Lists in a Certain Range
363raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
5 kyu
Recursive countdown
228surtich
Algorithms
Fundamentals
Functional Programming
6 kyu
Framed Reflection
2,327PG1
Fundamentals
Strings
Arrays
6 kyu
Sort the columns of a csv-file
969user5036852
Strings
Arrays
Algorithms
Sorting
8 kyu
String repeat
279,907wichu
Fundamentals
Strings
6 kyu
Counting Duplicates
216,033kgashok
Strings
Fundamentals
5 kyu
Simple Pig Latin
153,405user2505876
Regular Expressions
Algorithms
6 kyu
Fun with lists: countIf
1,462janitormeir
Lists
Functional Programming
Fundamentals
6 kyu
Insert value into an array
428AzariasB
Arrays
Fundamentals
5 kyu
Reversi row rudiments
201Insti
Games
Algorithms
Retired
Format a string of names like 'Bart, Lisa & Maggie'. (retired)
71,234weavermedia
Fundamentals
Strings
Data Types
Formatting
Algorithms
Logic
6 kyu
Fun with lists: filter
1,088janitormeir
Lists
Functional Programming
Fundamentals
6 kyu
Basics 05: Text Search
239smile67
Fundamentals
Strings
Lists
Algorithms
6 kyu
Pair of gloves
14,528AzariasB
Arrays
Puzzles
5 kyu
Human Readable Time
133,874BattleRattle
Date Time
Mathematics
Algorithms
6 kyu
Multiply list by integer (with restrictions)
793suic
Puzzles
Lists
Functional Programming
Restricted
6 kyu
Create Phone Number
311,762xDranik
Arrays
Strings
Regular Expressions
Algorithms
6 kyu
Age from DOB
182Exadon
Date Time
Fundamentals
6 kyu
zipWith
6,494JohanWiltink
Lists
Arrays
Functional Programming
Algorithms
5 kyu
A Chain adding function
27,560gelus
Mathematics
Functional Programming
Puzzles
4 kyu
Strings Mix
22,151g964
Fundamentals
Strings
6 kyu
Reverse polish notation calculator
10,910vgrichina
Algorithms
Mathematics
Interpreters
Parsing
Strings
6 kyu
Clock in Mirror
3,650aryan-firouzian
Fundamentals
4 kyu
Functional streams
722muesli4
Streams
Functional Programming
Algorithms
6 kyu
How Much?
6,521g964
Fundamentals
Retired
Median fun fun (retired)
780majakudlicka
Fundamentals
Arrays
Data Types
Basic Language Features
Mathematics
Algorithms
Logic
Numbers
6 kyu
Dashatize it
13,452Dragoris
Strings
Arrays
Regular Expressions
Fundamentals
4 kyu
Sum of Intervals
36,083xDranik
Algorithms
Performance
6 kyu
Coding Meetup #7 - Higher-Order Functions Series - Find the most senior developer
5,442PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
6 kyu
Title Case
35,738user527539
Strings
Fundamentals
6 kyu
Color Choice
2,744g964
Combinatorics
Mathematics
6 kyu
The Supermarket Queue
47,756mattlub
Arrays
Fundamentals
6 kyu
Fun with lists: map
1,609janitormeir
Lists
Functional Programming
Fundamentals
6 kyu
Two Joggers
8,824haan
Mathematics
Algorithms
6 kyu
Linked Lists - Iterative Reverse
551JDeBolt
Linked Lists
Data Structures
Algorithms
6 kyu
Linked Lists - Recursive Reverse
873JDeBolt
Linked Lists
Data Structures
Algorithms
6 kyu
Linked Lists - Sorted Intersect
494JDeBolt
Linked Lists
Data Structures
Algorithms
6 kyu
Linked Lists - Sorted Merge
691JDeBolt
Linked Lists
Data Structures
Algorithms
6 kyu
Linked Lists - Shuffle Merge
657JDeBolt
Linked Lists
Data Structures
Algorithms
6 kyu
Linked Lists - Merge Sort
446JDeBolt
Linked Lists
Data Structures
Algorithms
Sorting
Recursion
5 kyu
Linked Lists - Front Back Split
823JDeBolt
Linked Lists
Data Structures
Fundamentals
5 kyu
Linked Lists - Alternating Split
1,468JDeBolt
Data Structures
Linked Lists
Fundamentals
7 kyu
Linked Lists - Move Node
1,575JDeBolt
Linked Lists
Data Structures
Fundamentals
6 kyu
Linked Lists - Remove Duplicates
1,984JDeBolt
Linked Lists
Data Structures
Fundamentals
7 kyu
Linked Lists - Append
2,882JDeBolt
Linked Lists
Data Structures
Fundamentals
6 kyu
Linked Lists - Insert Sort
1,095JDeBolt
Linked Lists
Data Structures
Fundamentals
Sorting
6 kyu
Linked Lists - Sorted Insert
2,162JDeBolt
Linked Lists
Data Structures
Fundamentals
6 kyu
Linked Lists - Insert Nth Node
2,498JDeBolt
Linked Lists
Data Structures
Fundamentals
6 kyu
Linked Lists - Length & Count
9,436JDeBolt
Linked Lists
Data Structures
Fundamentals
7 kyu
Linked Lists - Get Nth Node
5,327JDeBolt
Linked Lists
Data Structures
Fundamentals
6 kyu
Acronym Buster
459pbywater
Regular Expressions
Parsing
Strings
Algorithms
6 kyu
up AND down
2,958g964
Fundamentals
Strings
6 kyu
SQL Bug Fixing: Fix the QUERY - Totaling
8,431matt c
Fundamentals
SQL
Data Science
8 kyu
SQL Grasshopper: Select Columns
18,236MorganJr
SQL
Fundamentals
6 kyu
Character counts
314RobinKnipe
Fundamentals
Algorithms
Strings
6 kyu
Fun with lists: reduce
1,040janitormeir
Lists
Functional Programming
Fundamentals
6 kyu
Find the unique number
134,861isqua
Fundamentals
Algorithms
Arrays
6 kyu
Count the days!
2,016zruF
Date Time
Fundamentals
5 kyu
Fun with trees: is perfect
1,401janitormeir
Trees
Recursion
Binary Trees
Binary Search Trees
Data Structures
Algorithms
6 kyu
Minutes to Midnight
1,047zruF
Date Time
Fundamentals
5 kyu
Coding with Squared Strings
1,990g964
Fundamentals
Strings
Ciphers
Cryptography
6 kyu
Reducing by steps
4,242g964
Mathematics
Arrays
Functional Programming
Lists
Data Structures
6 kyu
Count characters in your string
85,230riston
Strings
Fundamentals
6 kyu
Simple Web Framework #1: Create a basic router
1,483int3_0xcc
Object-oriented Programming
Arrays
Fundamentals
6 kyu
Organise duplicate numbers in list
2,113dangerdak
Arrays
Sorting
Fundamentals