Kotlin
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Kotlin
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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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8 kyu
Basic subclasses - Adam and Eve
19,163hansrusten
Fundamentals
Object-oriented Programming
8 kyu
Color Ghost
20,399ogryzek
Object-oriented Programming
Fundamentals
8 kyu
OOP: Object Oriented Piracy
21,640By-The-Ocean
Object-oriented Programming
Fundamentals
8 kyu
Finish Guess the Number Game
10,307brunolm
Fundamentals
Object-oriented Programming
8 kyu
Classy Classes
18,135matt c
Fundamentals
Object-oriented Programming
8 kyu
Classy Extentions
12,505matt c
Fundamentals
Object-oriented Programming
8 kyu
Playing with cubes II
8,853Jotha
Fundamentals
Object-oriented Programming
7 kyu
Remove All The Marked Elements of a List
11,733raulbc777
Fundamentals
Algorithms
Data Structures
7 kyu
Person Class Bug
7,769jhoffner
Debugging
Object-oriented Programming
7 kyu
User class for Banking System
4,355FourthFan
Fundamentals
Object-oriented Programming
7 kyu
Two fighters, one winner.
28,552Scopula
Games
Algorithms
Logic
Fundamentals
7 kyu
Python's Dynamic Classes #1
1,761adam-tokarski
Fundamentals
Object-oriented Programming
7 kyu
Python's Dynamic Classes #2
1,159adam-tokarski
Fundamentals
Object-oriented Programming
5 kyu
Python's Dynamic Classes #3
475adam-tokarski
Fundamentals
Object-oriented Programming
7 kyu
Make Class
2,468Jomopipi
Object-oriented Programming
Algorithms
7 kyu
Testing 1-2-3
80,878acr
Arrays
Fundamentals
7 kyu
Refactored Greeting
12,015jhoffner
Object-oriented Programming
Refactoring
7 kyu
These are not my grades! (Revamped !)
1,415kingcobra
Object-oriented Programming
Debugging
Fundamentals
7 kyu
Building Spheres
3,137NaMe613
Object-oriented Programming
Fundamentals
7 kyu
Split The Bill
8,647otajor
Fundamentals
Data Structures
7 kyu
The Lazy Startup Office
2,193Cleop
Arrays
Matrix
Fundamentals
7 kyu
Anything
713amrdraz
Object-oriented Programming
Fundamentals
7 kyu
Competitive eating scoreboard
1,504sofiapoh
Object-oriented Programming
Fundamentals
7 kyu
Building blocks
13,222NaMe613
Object-oriented Programming
Fundamentals
Retired
makeAcronym (retired)
1,601AkyunaAkish
Fundamentals
Strings
7 kyu
makeBackronym
6,588AkyunaAkish
Fundamentals
Strings
7 kyu
reverseIt
2,343AkyunaAkish
Fundamentals
Retired
Unlimited Sum (retired)
4,586Lordnibbler
Mathematics
Fundamentals
7 kyu
First-Class Function Factory
7,614otajor
Fundamentals
Functional Programming
Arrays
6 kyu
DefaultList
724beniolenio
Fundamentals
6 kyu
Who has the most money?
4,905MrAppa
Object-oriented Programming
Algorithms
6 kyu
JSON Class Decorator
482SquishyStrawberry
Fundamentals
Object-oriented Programming
6 kyu
Level Up!
191NULLHE4D
Iterators
Algorithms
6 kyu
Simple Web Framework #1: Create a basic router
1,618int3_0xcc
Object-oriented Programming
Arrays
Fundamentals
6 kyu
Image host filename generator
6,435int3_0xcc
Logic
Object-oriented Programming
Strings
Fundamentals
6 kyu
Implement the Fractions class
1,657Dr.RiD
Fundamentals
Object-oriented Programming
6 kyu
Expected Type Decorator
513filipkonieczny
Fundamentals
Design Patterns
Object-oriented Programming
6 kyu
Construct Graph Class (simple)
373Joz
Object-oriented Programming
Fundamentals
Graph Theory
6 kyu
High score table
1,590kingcobra
Algorithms
Sorting
Searching
Arrays
Object-oriented Programming
6 kyu
RPS Knockout Tournament Winner
256FrankK
Games
Algorithms
Game Solvers
Design Patterns
Object-oriented Programming
6 kyu
Hex cipher
327kingcobra
Cryptography
Object-oriented Programming
Ciphers
Algorithms
6 kyu
Bingo Card
6,884FrankK
Games
Algorithms
6 kyu
A functional deck of cards....
874thatrubylove
Functional Programming
Fundamentals
6 kyu
Sortable Shapes
2,867FrankK
Sorting
Fundamentals
Mathematics
Design Patterns
Arrays
Geometry
6 kyu
Simple Substitution Cipher Helper
3,688jacobb
Ciphers
Security
Object-oriented Programming
Strings
Algorithms
6 kyu
Timer Decorator
835filipkonieczny
Fundamentals
Design Patterns
Object-oriented Programming
Date Time
6 kyu
Keyword Cipher Helper
953jacobb
Cryptography
Ciphers
Security
Object-oriented Programming
Strings
6 kyu
You look like a classy instance! Show me what you've got! - Part 1
609Skratch
Data Structures
Strings
Lists
Fundamentals
Object-oriented Programming
6 kyu
Node Mania
1,224marcsantiago
Linked Lists
Algorithms
Data Structures
5 kyu
Readable Specification Pattern
85FArekkusu
Fundamentals
Object-oriented Programming
Design Patterns
5 kyu
Snakes and Ladders
7,403adrian.eyre
Design Patterns
Games
Fundamentals
5 kyu
Simple Finite State Machine Compiler
803awesomeaf
State Machines
Interpreters
Compilers
5 kyu
Vector Class
885Detry322
Fundamentals
Object-oriented Programming
5 kyu
Connect 4
1,602adrian.eyre
Arrays
Fundamentals
5 kyu
Limited number of instances
98FArekkusu
Object-oriented Programming
Metaprogramming
5 kyu
Refactor a node-based calculator (DRY)
130FArekkusu
Refactoring
Object-oriented Programming
Restricted
5 kyu
Lazy Repeater
8,094nklein
Iterators
Algorithms
5 kyu
Self-closing Cookie Jar
232ecolban
Object-oriented Programming
Fundamentals
5 kyu
Features of a Given Array
357raulbc777
Fundamentals
Data Structures
Algorithms
Sorting
Mathematics
Logic
Object-oriented Programming
5 kyu
Binary Search Trees
633ecolban
Object-oriented Programming
Algorithms
Data Structures
5 kyu
PaginationHelper
42,342jhoffner
Object-oriented Programming
Arrays
Algorithms
5 kyu
Caesar Cipher Helper
5,192eugene-bulkin
Ciphers
Object-oriented Programming
Strings
Algorithms
5 kyu
Vigenère Autokey Cipher Helper
1,230jacobb
Algorithms
Ciphers
Security
Object-oriented Programming
Strings
5 kyu
Vector class
8,807eugene-bulkin
Object-oriented Programming
Algorithms
Linear Algebra
4 kyu
5x5 Nonogram Solver
545Avanta
Algorithms
Logic
Games
Game Solvers
4 kyu
The Greatest Warrior
3,621BurstNova
Algorithms
Object-oriented Programming
4 kyu
Ranking Poker Hands
3,549FrankK
Games
Algorithms
Object-oriented Programming
4 kyu
Sortable Poker Hands
495FrankK
Games
Fundamentals
Sorting
Design Patterns
Algorithms
4 kyu
Vigenère Cipher Helper
8,787jacobb
Algorithms
Ciphers
Security
Object-oriented Programming
Strings
3 kyu
Metaclasses - Simple Django Models
317horejsek
Object-oriented Programming
Metaprogramming
Backend
3 kyu
Papers, Please
807docgunthrop
Object-oriented Programming
Games
Regular Expressions
Fundamentals
3 kyu
Blobservation
397docgunthrop
Logic
Games
Object-oriented Programming
Performance
Algorithms
2 kyu
Change detection decorator
201zellerede
Decorator
Algorithms
Metaprogramming
2 kyu
Full Metal Chemist #1: build me...
364Blind4Basics
Object-oriented Programming
Fundamentals
2 kyu
Debugger
687Dundee
Metaprogramming