Kata Library: Ruby Practice
Sign Up
Time to claim your honor
Training
Practice
Complete challenging
Kata
to earn honor and ranks. Re-train to hone technique
Freestyle Sparring
Take turns remixing and refactoring others code through
Kumite
Community
Leaderboards
Achieve honor and move up the global leaderboards
Chat
Join our
Discord
server and chat with your fellow code warriors
Discussions
View our
Github Discussions
board to discuss general Codewars topics
About
Docs
Learn about all of the different aspects of Codewars
Blog
Read the latest news from Codewars and the community
Log In
Sign Up
Library
Collections
Newest
Oldest
Popularity
Positive Feedback
Most Completed
Least Completed
Hardest
Easiest
Name
Relevance
Low Satisfaction
All
My Languages
Agda (Beta)
BF (Beta)
C
CFML (Beta)
Clojure
COBOL (Beta)
CoffeeScript
CommonLisp (Beta)
Coq
C++
Crystal
C#
D (Beta)
Dart
Elixir
Elm (Beta)
Erlang (Beta)
Factor (Beta)
Forth (Beta)
Fortran (Beta)
F#
Go
Groovy
Haskell
Haxe (Beta)
Idris (Beta)
Java
JavaScript
Julia (Beta)
Kotlin
λ Calculus (Beta)
Lean
Lua
NASM
Nim (Beta)
Objective-C (Beta)
OCaml (Beta)
Pascal (Beta)
Perl (Beta)
PHP
PowerShell (Beta)
Prolog (Beta)
PureScript (Beta)
Python
R (Beta)
Racket
Raku (Beta)
Reason (Beta)
RISC-V (Beta)
Ruby
Rust
Scala
Shell
Solidity (Beta)
SQL
Swift
TypeScript
VB (Beta)
Approved & Beta
Approved
Beta
All
Kata I have not trained on
Kata I have not completed
Kata I have completed
8 kyu
easiest
7 kyu
6 kyu
5 kyu
4 kyu
3 kyu
2 kyu
1 kyu
hardest
Algorithms
51
Arrays
51
Binary
1
Bits
1
Ciphers
1
Cryptography
2
Data Structures
14
Functional Programming
6
Fundamentals
51
Games
3
Lists
6
Logic
1
Mathematics
5
Performance
6
Puzzles
2
Regular Expressions
7
Security
1
Sorting
8
Strings
11
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
51 Kata Found
7 kyu
Coding Meetup #4 - Higher-Order Functions Series - Find the first Python developer
10,266
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Strings
Regular Expressions
7 kyu
Coding Meetup #2 - Higher-Order Functions Series - Greet developers
12,732
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
7 kyu
Coding Meetup #1 - Higher-Order Functions Series - Count the number of JavaScript developers coming from Europe
16,457
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
8 kyu
Count the Monkeys!
73,270
PG1
1 Issue Reported
Arrays
Fundamentals
Lists
Algorithms
7 kyu
Coding Meetup #3 - Higher-Order Functions Series - Is Ruby coming?
11,053
PiotrBerebecki
Data Structures
Fundamentals
Algorithms
Strings
Regular Expressions
Arrays
Functional Programming
6 kyu
Find the unique number
153,631
isqua
4 Issues Reported
Fundamentals
Algorithms
Arrays
Performance
7 kyu
The Poet And The Pendulum
4,826
MrZizoScream
4 Issues Reported
Fundamentals
Arrays
Algorithms
Performance
7 kyu
Tetris Series #1 — Scoring System
1,931
Etoneja
1 Issue Reported
Fundamentals
Games
Algorithms
Arrays
5 kyu
The Primes as a Result of the Longest Consecutive Sum I
194
raulbc777
Performance
Algorithms
Mathematics
Data Structures
Arrays
Fundamentals
7 kyu
Mirror, mirror, on the wall...
3,362
David Gildour
Algorithms
Fundamentals
Arrays
7 kyu
Sports league table - help your local team!
489
mcelearr
2 Issues Reported
Fundamentals
Arrays
Algorithms
7 kyu
Pair Zeros
2,362
Nianpeng
Algorithms
Arrays
Fundamentals
Functional Programming
7 kyu
SCHEDULE YOUR DA(RRA)Y
1,429
alexis-l8
5 Issues Reported
Arrays
Algorithms
Mathematics
Fundamentals
6 kyu
Oracle: Coin Method
260
Aquila
Algorithms
Arrays
Sorting
Games
Fundamentals
7 kyu
Simple Fun #399: Make Ascending Sequences
358
myjinxin2015
Fundamentals
Arrays
Algorithms
7 kyu
Coding Meetup #17 - Higher-Order Functions Series - Sort by programming language
2,149
PiotrBerebecki
Functional Programming
Data Structures
Arrays
Fundamentals
Algorithms
Sorting
5 kyu
Numbers with The Highest Amount of Divisors
605
raulbc777
4 Issues Reported
Fundamentals
Algorithms
Data Structures
Mathematics
Arrays
5 kyu
Sports League Table Ranking
588
cshw89
Fundamentals
Algorithms
Arrays
Sorting
7 kyu
Fizz Buzz
26,462
stephenyu
7 Issues Reported
Algorithms
Fundamentals
Arrays
7 kyu
Product of Largest Pair
3,380
10XL
1 Issue Reported
Fundamentals
Arrays
Algorithms
Sorting
8 kyu
Enumerable Magic #20 - Cascading Subsets
8,983
bellmyer
2 Issues Reported
Fundamentals
Lists
Data Structures
Arrays
Algorithms
7 kyu
Between Extremes
8,673
TroyMaeder
Algorithms
Fundamentals
Arrays
6 kyu
+1 Array
12,676
khelmar
2 Issues Reported
Fundamentals
Arrays
Algorithms
7 kyu
Plastic Balance
625
Eyad Hantouli
Fundamentals
Algorithms
Lists
Data Structures
Arrays
6 kyu
Simple Encryption #1 - Alternating Split
29,703
user5036852
3 Issues Reported
Cryptography
Algorithms
Strings
Arrays
Fundamentals
6 kyu
Encrypt this!
23,623
suic
Fundamentals
Strings
Regular Expressions
Arrays
Ciphers
Algorithms
Cryptography
Security
6 kyu
Equal Sides Of An Array
133,012
Shivo
Algorithms
Arrays
Fundamentals
6 kyu
Two Sum
88,056
wthit56
12 Issues Reported
Arrays
Fundamentals
Algorithms
6 kyu
Array.diff
302,105
marcinbunsch
2 Issues Reported
Arrays
Fundamentals
Algorithms
7 kyu
Double Every Other
7,370
Adam-Morris
Fundamentals
Lists
Arrays
Algorithms
Loading...
Confirm
Collect:
undefined
Loading collection data...