Title Tags Difficulty Solutions Submitter
&& Versus And operators, presidence Elementary 1570 david
A Man, A Plan, A Canal--Panama! strings Easy 324
Alternate Array Notation arrays Elementary 1179 david
An Unconventional Join rails, join, arrays, strings Easy 109 david
Architecting a Solution structs, classes Easy 278 david
Array Item Removal arrays Elementary 1439 david
Array to Hash arrays, hashes Medium 246 tylera
Architect of SixCity algorithm, math, random, optimization Hard 9 tarvit
Baby Got Stacks classes, stacks Elementary 715
Battleship arithmetic, rand, game Medium 68 tarvit
Bigger element array Elementary 494 rinaldifonseca
Blackjack arithmetic, splat operator Elementary 2004
Brackets and Searches strings Elementary 1254 david
Caution Case case statements, ranges Elementary 1073 masassiez
Class Test object-oriented programming, classes Easy 842 david
Constant Rule constant Easy 620 usa
Counting Elements in Array arrays Easy 271 lucascaton
Default Encoding encoding Elementary 593 znz
Defined? Or not? Object, defined? Elementary 882 lucascaton
Defusing a Bomb nil, exceptions Easy 338 david
Each With Object ruby 1.9, enumerables Easy 531 david
Fixing Bad Code the Wrong Way method_missing, classes Easy 369
FizzBuzz arithmetic, strings Elementary 2340
Generating Random Numbers rand Easy 772 david
Getters and Setters classes Elementary 1171 david
Guess the Sequence math, integers Medium 67 david
Happy Numbers arithmetic Medium 198
Hello? Yes, This Is Dog strings, regular expressions Medium 219
Hello World strings Elementary 3071
I Put Some S-Expressions in Your Ruby s-expressions, functional programming Medium 60 david
Implement a Hash With Indifferent Access hashes, classes Easy 163 david
Implement Array#abbrev arrays, hash Medium 53 znz
Implement Array#duplicates arrays Medium 89 david
Implement Array#each enumerables Medium 157 nilbus2
Implement Array#flatten arrays Medium 134 david
Implement Array#interleave arrays Easy 248 david
Implement Array#transpose arrays Medium 120 znz
Implement Object#try objects, nil Medium 149 david
Implement Shellwords.split strings Medium 44 znz
Including Modules classes, modules Easy 682 david
Injected and Rejected arithmetic, enumerables Elementary 1626
Introduction to Regular Expressions strings, regular expressions Easy 585
The Truth booleans Elementary 3478
Join URL params url, params Easy 244 lucascaton
Like a Snowflake arrays Medium 122 david
Keep Our Parks Clean! metaprogramming Medium 115 kbennoune
Map enumerables Elementary 2571
Mason's Spades Problem probability, arithmetic Hard 9
Maximum numbers Elementary 2820
Method Acting methods, metaprogramming Easy 587 david
Module Inheritance modules, classes, object-oriented programming Medium 96 kbennoune
Nil Values nil, booleans Elementary 2734
No Limit strings Elementary 797 masassiez
One of These is Not Like the Others arrays, classes Medium 144 david
Pack Template UTF-8 pack Easy 134 znz
Pascal's Triangle math, arithmetic Medium 109 david
Phanaeng Curry lambdas, functions, functional programming Elementary 532 david
Picking Lottery Numbers arrays Easy 637 david
Pigs Fly; Wait, No They Don't. exceptions Medium 303
Prime Factorization math, primes, factorization Medium 96 david
Prime Factors arithmetic Medium 157
Quelle Heure Est-Il? dates, strings Easy 146
Queue Continuum classes, queues Elementary 902
Redefining Splat splat operator, unary, asterik Easy 118 shugo
Regular Expressions Revisted regular expressions, strings, arrays Medium 102
Reverse strings Elementary 3106
Reverse Array Using For arrays, for, loops Medium 87 shugo
Reverse Each Word strings, enumerables Easy 949
Select Map enumerables, procs Easy 128 masassiez
Separating Numbers with Commas strings, regular expressions Easy 467 naruse
Set Intersection arrays Elementary 1227 znz
Shortest Path Hard 24 Mason
Shotgun Assignment variables Elementary 523 pelargir
Simple String Substitution strings Easy 148 david
Something Doesn't Add Up arithmetic Medium 286 dghopkins
Subtracting Out The Sugar arithmetic Elementary 1313 david
Sum of Primes sum, enumerables, primes, arithmetic Medium 111 mstalker
Temperature Robot case statements, ranges, ranges Elementary 1794
The Curious Case of the Missing Method enumerables, arrays Elementary 2120
The Curious Case of the Missing Method Part 2 enumerables Elementary 1818
The Curious Case of the Missing Method Part 3 methods, enumerables Elementary 896 david
The Curious Case of the Missing Method Part 4 classes Elementary 686 david
The Curious Case of the Missing Method Part 5 arrays Elementary 635 david
The Gray Area booleans Easy 240 david
The Limits of Probability arithmetic, probability, rand Elementary 858 david
The Little Hash Key that Could hash Easy 690 jmpeck
The Traveling Salesman genetic programming Medium 45 david
There's No Way This Works strings Elementary 1609 david
Transpose Me matrices Medium 35 Mason
Traversing a Hash hashes Medium 137 david
Validating Credit Card Numbers strings, enumerables Medium 125 irkenInvader
What's Your Area of Expertise objects, geometry Easy 548 RubyRedRick
Your Favorite and Mine, Fibonacci! arithmetic Easy 711
Random Boolean rand, booleans Easy 410 znz
The Lambda Lambda Lambda Fraternity lambdas, procs, ruby 1.9 Easy 506
Ternary Operator operators, ternary operators Elementary 992 david
Unidentified X Object strings, operators Easy 221 masassiez
Or Equal operators Elementary 1420 david
There's No Way This Works Version 2 strings Elementary 1404 david
Home on the Range ranges Elementary 1329
Version Sort arrays Medium 59 znz