Title Tags Difficulty Solutions Submitter
&& Versus And operators, presidence Elementary 1572 david
A Man, A Plan, A Canal--Panama! strings Easy 324
Alternate Array Notation arrays Elementary 1181 david
An Unconventional Join rails, join, arrays, strings Easy 109 david
Architecting a Solution structs, classes Easy 278 david
Array Item Removal arrays Elementary 1441 david
Array to Hash arrays, hashes Medium 247 tylera
Architect of SixCity algorithm, math, random, optimization Hard 10 tarvit
Baby Got Stacks classes, stacks Elementary 716
Battleship arithmetic, rand, game Medium 68 tarvit
Bigger element array Elementary 495 rinaldifonseca
Blackjack arithmetic, splat operator Elementary 2006
Brackets and Searches strings Elementary 1256 david
Caution Case case statements, ranges Elementary 1075 masassiez
Class Test object-oriented programming, classes Easy 843 david
Constant Rule constant Easy 621 usa
Counting Elements in Array arrays Easy 272 lucascaton
Default Encoding encoding Elementary 594 znz
Defined? Or not? Object, defined? Elementary 883 lucascaton
Defusing a Bomb nil, exceptions Easy 339 david
Each With Object ruby 1.9, enumerables Easy 532 david
Fixing Bad Code the Wrong Way method_missing, classes Easy 369
FizzBuzz arithmetic, strings Elementary 2343
Generating Random Numbers rand Easy 773 david
Getters and Setters classes Elementary 1173 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 3074
I Put Some S-Expressions in Your Ruby s-expressions, functional programming Medium 60 david
Implement a Hash With Indifferent Access hashes, classes Easy 164 david
Implement Array#abbrev arrays, hash Medium 53 znz
Implement Array#duplicates arrays Medium 89 david
Implement Array#each enumerables Medium 158 nilbus2
Implement Array#flatten arrays Medium 134 david
Implement Array#interleave arrays Easy 249 david
Implement Array#transpose arrays Medium 120 znz
Implement Object#try objects, nil Medium 150 david
Implement Shellwords.split strings Medium 44 znz
Including Modules classes, modules Easy 683 david
Injected and Rejected arithmetic, enumerables Elementary 1628
Introduction to Regular Expressions strings, regular expressions Easy 587
The Truth booleans Elementary 3486
Join URL params url, params Easy 245 lucascaton
Like a Snowflake arrays Medium 122 david
Keep Our Parks Clean! metaprogramming Medium 115 kbennoune
Map enumerables Elementary 2573
Mason's Spades Problem probability, arithmetic Hard 9
Maximum numbers Elementary 2823
Method Acting methods, metaprogramming Easy 589 david
Module Inheritance modules, classes, object-oriented programming Medium 96 kbennoune
Nil Values nil, booleans Elementary 2737
No Limit strings Elementary 799 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 533 david
Picking Lottery Numbers arrays Easy 638 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 903
Redefining Splat splat operator, unary, asterik Easy 118 shugo
Regular Expressions Revisted regular expressions, strings, arrays Medium 102
Reverse strings Elementary 3114
Reverse Array Using For arrays, for, loops Medium 87 shugo
Reverse Each Word strings, enumerables Easy 950
Select Map enumerables, procs Easy 128 masassiez
Separating Numbers with Commas strings, regular expressions Easy 468 naruse
Set Intersection arrays Elementary 1229 znz
Shortest Path Hard 24 Mason
Shotgun Assignment variables Elementary 526 pelargir
Simple String Substitution strings Easy 148 david
Something Doesn't Add Up arithmetic Medium 286 dghopkins
Subtracting Out The Sugar arithmetic Elementary 1315 david
Sum of Primes sum, enumerables, primes, arithmetic Medium 111 mstalker
Temperature Robot case statements, ranges, ranges Elementary 1796
The Curious Case of the Missing Method enumerables, arrays Elementary 2122
The Curious Case of the Missing Method Part 2 enumerables Elementary 1820
The Curious Case of the Missing Method Part 3 methods, enumerables Elementary 897 david
The Curious Case of the Missing Method Part 4 classes Elementary 688 david
The Curious Case of the Missing Method Part 5 arrays Elementary 636 david
The Gray Area booleans Easy 241 david
The Limits of Probability arithmetic, probability, rand Elementary 859 david
The Little Hash Key that Could hash Easy 691 jmpeck
The Traveling Salesman genetic programming Medium 45 david
There's No Way This Works strings Elementary 1612 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 549 RubyRedRick
Your Favorite and Mine, Fibonacci! arithmetic Easy 712
Random Boolean rand, booleans Easy 411 znz
The Lambda Lambda Lambda Fraternity lambdas, procs, ruby 1.9 Easy 507
Ternary Operator operators, ternary operators Elementary 994 david
Unidentified X Object strings, operators Easy 222 masassiez
Or Equal operators Elementary 1423 david
There's No Way This Works Version 2 strings Elementary 1407 david
Home on the Range ranges Elementary 1331
Version Sort arrays Medium 59 znz