Title Tags Difficulty Solutions Submitter
&& Versus And operators, presidence Elementary 1578 david
A Man, A Plan, A Canal--Panama! strings Easy 326
Alternate Array Notation arrays Elementary 1185 david
An Unconventional Join rails, join, arrays, strings Easy 110 david
Architecting a Solution structs, classes Easy 280 david
Array Item Removal arrays Elementary 1446 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 717
Battleship arithmetic, rand, game Medium 68 tarvit
Bigger element array Elementary 496 rinaldifonseca
Blackjack arithmetic, splat operator Elementary 2012
Brackets and Searches strings Elementary 1260 david
Caution Case case statements, ranges Elementary 1079 masassiez
Class Test object-oriented programming, classes Easy 844 david
Constant Rule constant Easy 622 usa
Counting Elements in Array arrays Easy 274 lucascaton
Default Encoding encoding Elementary 595 znz
Defined? Or not? Object, defined? Elementary 885 lucascaton
Defusing a Bomb nil, exceptions Easy 340 david
Each With Object ruby 1.9, enumerables Easy 533 david
Fixing Bad Code the Wrong Way method_missing, classes Easy 371
FizzBuzz arithmetic, strings Elementary 2350
Generating Random Numbers rand Easy 774 david
Getters and Setters classes Elementary 1177 david
Guess the Sequence math, integers Medium 67 david
Happy Numbers arithmetic Medium 200
Hello? Yes, This Is Dog strings, regular expressions Medium 221
Hello World strings Elementary 3086
I Put Some S-Expressions in Your Ruby s-expressions, functional programming Medium 61 david
Implement a Hash With Indifferent Access hashes, classes Easy 165 david
Implement Array#abbrev arrays, hash Medium 54 znz
Implement Array#duplicates arrays Medium 90 david
Implement Array#each enumerables Medium 158 nilbus2
Implement Array#flatten arrays Medium 134 david
Implement Array#interleave arrays Easy 250 david
Implement Array#transpose arrays Medium 121 znz
Implement Object#try objects, nil Medium 150 david
Implement Shellwords.split strings Medium 45 znz
Including Modules classes, modules Easy 684 david
Injected and Rejected arithmetic, enumerables Elementary 1633
Introduction to Regular Expressions strings, regular expressions Easy 588
The Truth booleans Elementary 3499
Join URL params url, params Easy 246 lucascaton
Like a Snowflake arrays Medium 123 david
Keep Our Parks Clean! metaprogramming Medium 116 kbennoune
Map enumerables Elementary 2582
Mason's Spades Problem probability, arithmetic Hard 9
Maximum numbers Elementary 2834
Method Acting methods, metaprogramming Easy 590 david
Module Inheritance modules, classes, object-oriented programming Medium 96 kbennoune
Nil Values nil, booleans Elementary 2747
No Limit strings Elementary 801 masassiez
One of These is Not Like the Others arrays, classes Medium 145 david
Pack Template UTF-8 pack Easy 135 znz
Pascal's Triangle math, arithmetic Medium 110 david
Phanaeng Curry lambdas, functions, functional programming Elementary 534 david
Picking Lottery Numbers arrays Easy 639 david
Pigs Fly; Wait, No They Don't. exceptions Medium 304
Prime Factorization math, primes, factorization Medium 97 david
Prime Factors arithmetic Medium 158
Quelle Heure Est-Il? dates, strings Easy 147
Queue Continuum classes, queues Elementary 905
Redefining Splat splat operator, unary, asterik Easy 118 shugo
Regular Expressions Revisted regular expressions, strings, arrays Medium 103
Reverse strings Elementary 3127
Reverse Array Using For arrays, for, loops Medium 87 shugo
Reverse Each Word strings, enumerables Easy 951
Select Map enumerables, procs Easy 129 masassiez
Separating Numbers with Commas strings, regular expressions Easy 469 naruse
Set Intersection arrays Elementary 1233 znz
Shortest Path Hard 25 Mason
Shotgun Assignment variables Elementary 527 pelargir
Simple String Substitution strings Easy 148 david
Something Doesn't Add Up arithmetic Medium 286 dghopkins
Subtracting Out The Sugar arithmetic Elementary 1319 david
Sum of Primes sum, enumerables, primes, arithmetic Medium 113 mstalker
Temperature Robot case statements, ranges, ranges Elementary 1801
The Curious Case of the Missing Method enumerables, arrays Elementary 2129
The Curious Case of the Missing Method Part 2 enumerables Elementary 1825
The Curious Case of the Missing Method Part 3 methods, enumerables Elementary 899 david
The Curious Case of the Missing Method Part 4 classes Elementary 689 david
The Curious Case of the Missing Method Part 5 arrays Elementary 637 david
The Gray Area booleans Easy 242 david
The Limits of Probability arithmetic, probability, rand Elementary 861 david
The Little Hash Key that Could hash Easy 693 jmpeck
The Traveling Salesman genetic programming Medium 45 david
There's No Way This Works strings Elementary 1618 david
Transpose Me matrices Medium 36 Mason
Traversing a Hash hashes Medium 138 david
Validating Credit Card Numbers strings, enumerables Medium 126 irkenInvader
What's Your Area of Expertise objects, geometry Easy 550 RubyRedRick
Your Favorite and Mine, Fibonacci! arithmetic Easy 713
Random Boolean rand, booleans Easy 412 znz
The Lambda Lambda Lambda Fraternity lambdas, procs, ruby 1.9 Easy 508
Ternary Operator operators, ternary operators Elementary 997 david
Unidentified X Object strings, operators Easy 223 masassiez
Or Equal operators Elementary 1428 david
There's No Way This Works Version 2 strings Elementary 1412 david
Home on the Range ranges Elementary 1336
Version Sort arrays Medium 59 znz