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
Algebra
4
Algorithms
56
Arrays
7
Combinatorics
1
Data Structures
69
Dynamic Programming
2
Functional Programming
1
Fundamentals
69
Geometry
6
Linear Algebra
3
Lists
1
Logic
31
Mathematics
69
Matrix
4
Memoization
5
Number Theory
1
Performance
4
Permutations
4
Puzzles
2
Recursion
2
Searching
1
Sorting
10
Strings
19
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
69 Kata Found
6 kyu
Help Kiyo きよ solve her problems LCM Fun!
497
user8476848
Algorithms
Data Structures
Mathematics
Fundamentals
7 kyu
Operations With Sets
1,699
raulbc777
1 Issue Reported
Fundamentals
Data Structures
Mathematics
7 kyu
Numbers Which Sum of Powers of Its Digits Is The Same Number
3,228
raulbc777
2 Issues Reported
Fundamentals
Mathematics
Data Structures
6 kyu
A Combinatorial Way to Get Products and Sums of an Array
194
raulbc777
1 Issue Reported
Fundamentals
Mathematics
Data Structures
Algorithms
6 kyu
Selecting Quotients From an Array
276
raulbc777
1 Issue Reported
Fundamentals
Data Structures
Algorithms
Sorting
Mathematics
Logic
6 kyu
Find a Bunch of Common Elements of Two Lists in a Certain Range
912
raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
5 kyu
Working With Coloured Numbers
397
raulbc777
2 Issues Reported
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
Recursion
Dynamic Programming
6 kyu
Triangle of Multiples (Easy One)
771
raulbc777
3 Issues Reported
Mathematics
Data Structures
Fundamentals
7 kyu
Total Sums of Coefficients of a Binomial Raised to the Nth-Power
378
raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
6 kyu
Remove a Specific Element of an Array
950
raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
5 kyu
Primes in the Last Digits of Huge Numbers
140
raulbc777
1 Issue Reported
Fundamentals
Mathematics
Algorithms
Data Structures
5 kyu
Pandigital Powers
144
raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
5 kyu
Map and Filter to Get a Special Sequence of Integers
133
raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
7 kyu
Multiples By Permutations II
1,556
raulbc777
Fundamentals
Data Structures
Strings
Mathematics
Algebra
Sorting
Combinatorics
5 kyu
Generate Numbers From Digits #2
111
raulbc777
Fundamentals
Logic
Strings
Data Structures
Algorithms
Mathematics
Number Theory
Permutations
6 kyu
Help Mrs Jefferson
1,202
raulbc777
Fundamentals
Data Structures
Arrays
Mathematics
6 kyu
Generating Numbers From Digits #1
368
raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
5 kyu
Find the Partition with Maximum Product Value
425
raulbc777
3 Issues Reported
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
5 kyu
Find All the Possible Numbers Multiple of 3 with the Digits of a Positive Integer.
297
raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
Permutations
6 kyu
Estimating Amounts of Subsets
2,269
raulbc777
4 Issues Reported
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
5 kyu
Building a Sequence Cocatenating Digits with a Given Order.
193
raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
6 kyu
#4 Matrices: Process for a Square Matrix
362
raulbc777
Mathematics
Data Structures
Matrix
Linear Algebra
Fundamentals
6 kyu
#8 Matrices: Up and Down Sorting For Each Column
512
raulbc777
Fundamentals
Algorithms
Data Structures
Mathematics
Matrix
Sorting
5 kyu
Numbers that are a power of their sum of digits
2,123
raulbc777
3 Issues Reported
Algorithms
Mathematics
Sorting
Data Structures
Fundamentals
6 kyu
How Many Numbers?
1,082
raulbc777
4 Issues Reported
Fundamentals
Algorithms
Mathematics
Data Structures
5 kyu
How Many Numbers? II
1,377
raulbc777
3 Issues Reported
Algorithms
Data Structures
Mathematics
Fundamentals
6 kyu
Find the First Number in Having a Certain Number of Divisors I
938
raulbc777
3 Issues Reported
Fundamentals
Mathematics
Data Structures
Dynamic Programming
Memoization
5 kyu
Emirps
2,042
raulbc777
5 Issues Reported
Fundamentals
Mathematics
Algorithms
Data Structures
5 kyu
The Primes as a Result of the Longest Consecutive Sum I
194
raulbc777
Performance
Algorithms
Mathematics
Data Structures
Arrays
Fundamentals
4 kyu
How many numbers III?
4,521
raulbc777
4 Issues Reported
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Loading...
Confirm
Collect:
undefined
Loading collection data...