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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.

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7 kyu
String Reordering
7,923user3010812
Fundamentals
Strings
Lists
8 kyu
Remove duplicates from list
40,044wichu
Fundamentals
Arrays
Lists
7 kyu
Unpacking Arguments
13,402user578387
Functional Programming
Fundamentals
8 kyu
A Strange Trip to the Market
16,211sergarrick
Regular Expressions
Strings
Fundamentals
8 kyu
Classy Classes
18,309matt c
Fundamentals
Object-oriented Programming
8 kyu
Broken Counter
6,961BattleRattle
Debugging
Object-oriented Programming
8 kyu
Classy Extentions
12,676matt c
Fundamentals
Object-oriented Programming
8 kyu
SpeedCode #3 × Fun with ES6 Classes #5 - Dogs and Classes
3,170donaldsebleung
Object-oriented Programming
Refactoring
Puzzles
8 kyu
Barking mad
11,467niknmix
Fundamentals
Object-oriented Programming
7 kyu
Thinkful - Object Drills: Quarks
3,889Grae-Drake
Fundamentals
Object-oriented Programming
7 kyu
JavaScript class-like objects
11,377jhoffner
Object-oriented Programming
Fundamentals
7 kyu
Building blocks
13,311NaMe613
Object-oriented Programming
Fundamentals
7 kyu
What a "Classy" Song
5,117this is my username
Fundamentals
Object-oriented Programming
8 kyu
Playing with cubes II
8,931Jotha
Fundamentals
Object-oriented Programming
7 kyu
Fun with ES6 Classes #3 - Cuboids, Cubes and Getters
6,561donaldsebleung
Fundamentals
Object-oriented Programming
7 kyu
Fun with ES6 Classes #4 - Cubes and Setters
5,924donaldsebleung
Fundamentals
Object-oriented Programming
7 kyu
Fun with ES6 Classes #2 - Animals and Inheritance
14,130donaldsebleung
Fundamentals
Object-oriented Programming
7 kyu
Refactored Greeting
12,073jhoffner
Object-oriented Programming
Refactoring
8 kyu
Basic subclasses - Adam and Eve
19,267hansrusten
Fundamentals
Object-oriented Programming
7 kyu
Combine objects
9,464matthewglover
Arrays
Fundamentals
8 kyu
Take an Arrow to the knee, Functionally
14,792matt c
Arrays
Strings
Fundamentals
7 kyu
Colour Association
9,600nogainbar
Fundamentals
6 kyu
Primorial Of a Number
7,133MrZizoScream
Fundamentals
Arrays
Number Theory
7 kyu
Coding Meetup #5 - Higher-Order Functions Series - Prepare the count of languages
8,295PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
7 kyu
Digits Average
1,803marbiru
Algorithms
6 kyu
Find the most frequently occurring elements in arrays
476PiotrBerebecki
Algorithms
Data Structures
Arrays
Data Science
7 kyu
Find Count of Most Frequent Item in an Array
13,868Fosna
Data Structures
Fundamentals
7 kyu
Palindrome Pairs
724smepple
Lists
Strings
Fundamentals
7 kyu
Sum The Array
1,197vasekhlav
Arrays
Fundamentals
7 kyu
GA-DE-RY-PO-LU-KI cypher
2,876dcieslak
Fundamentals
Ciphers
Cryptography
7 kyu
Map over a list of lists
2,230Paul Robertson
Fundamentals
Lists
6 kyu
"this" is an other problem
3,128ZozoFouchtra
Object-oriented Programming
Debugging
Language Features
7 kyu
Numbers to Objects
4,600PG1
Fundamentals
Strings
Arrays
Retired
Can you fix this Script? (retired)
9Kasimonsan
Status:Retired
Estimated Rank:
7 kyu
7 kyu
LinkedList -> Array
5,371nivrad00
Data Structures
Arrays
Fundamentals