Title Tags Difficulty Solutions Submitter
&& Versus And operators, presidence Elementary 1542 david
A Man, A Plan, A Canal--Panama! strings Easy 319
Alternate Array Notation arrays Elementary 1160 david
An Unconventional Join rails, join, arrays, strings Easy 107 david
Architecting a Solution structs, classes Easy 275 david
Array Item Removal arrays Elementary 1414 david
Array to Hash arrays, hashes Medium 244 tylera
Architect of SixCity algorithm, math, random, optimization Hard 9 tarvit
Baby Got Stacks classes, stacks Elementary 706
Battleship arithmetic, rand, game Medium 68 tarvit
Bigger element array Elementary 485 rinaldifonseca
Blackjack arithmetic, splat operator Elementary 1967
Brackets and Searches strings Elementary 1236 david
Caution Case case statements, ranges Elementary 1054 masassiez
Class Test object-oriented programming, classes Easy 832 david
Constant Rule constant Easy 612 usa
Counting Elements in Array arrays Easy 266 lucascaton
Default Encoding encoding Elementary 586 znz
Defined? Or not? Object, defined? Elementary 870 lucascaton
Defusing a Bomb nil, exceptions Easy 332 david
Each With Object ruby 1.9, enumerables Easy 522 david
Fixing Bad Code the Wrong Way method_missing, classes Easy 363
FizzBuzz arithmetic, strings Elementary 2299
Generating Random Numbers rand Easy 763 david
Getters and Setters classes Elementary 1153 david
Guess the Sequence math, integers Medium 67 david
Happy Numbers arithmetic Medium 196
Hello? Yes, This Is Dog strings, regular expressions Medium 217
Hello World strings Elementary 3011
I Put Some S-Expressions in Your Ruby s-expressions, functional programming Medium 60 david
Implement a Hash With Indifferent Access hashes, classes Easy 160 david
Implement Array#abbrev arrays, hash Medium 53 znz
Implement Array#duplicates arrays Medium 88 david
Implement Array#each enumerables Medium 155 nilbus2
Implement Array#flatten arrays Medium 134 david
Implement Array#interleave arrays Easy 246 david
Implement Array#transpose arrays Medium 119 znz
Implement Object#try objects, nil Medium 149 david
Implement Shellwords.split strings Medium 44 znz
Including Modules classes, modules Easy 675 david
Injected and Rejected arithmetic, enumerables Elementary 1599
Introduction to Regular Expressions strings, regular expressions Easy 576
The Truth booleans Elementary 3408
Join URL params url, params Easy 241 lucascaton
Like a Snowflake arrays Medium 122 david
Keep Our Parks Clean! metaprogramming Medium 114 kbennoune
Map enumerables Elementary 2520
Mason's Spades Problem probability, arithmetic Hard 9
Maximum numbers Elementary 2766
Method Acting methods, metaprogramming Easy 580 david
Module Inheritance modules, classes, object-oriented programming Medium 95 kbennoune
Nil Values nil, booleans Elementary 2683
No Limit strings Elementary 790 masassiez
One of These is Not Like the Others arrays, classes Medium 142 david
Pack Template UTF-8 pack Easy 133 znz
Pascal's Triangle math, arithmetic Medium 109 david
Phanaeng Curry lambdas, functions, functional programming Elementary 526 david
Picking Lottery Numbers arrays Easy 630 david
Pigs Fly; Wait, No They Don't. exceptions Medium 302
Prime Factorization math, primes, factorization Medium 95 david
Prime Factors arithmetic Medium 157
Quelle Heure Est-Il? dates, strings Easy 144
Queue Continuum classes, queues Elementary 890
Redefining Splat splat operator, unary, asterik Easy 118 shugo
Regular Expressions Revisted regular expressions, strings, arrays Medium 102
Reverse strings Elementary 3037
Reverse Array Using For arrays, for, loops Medium 87 shugo
Reverse Each Word strings, enumerables Easy 938
Select Map enumerables, procs Easy 128 masassiez
Separating Numbers with Commas strings, regular expressions Easy 459 naruse
Set Intersection arrays Elementary 1206 znz
Shortest Path Hard 24 Mason
Shotgun Assignment variables Elementary 514 pelargir
Simple String Substitution strings Easy 145 david
Something Doesn't Add Up arithmetic Medium 283 dghopkins
Subtracting Out The Sugar arithmetic Elementary 1295 david
Sum of Primes sum, enumerables, primes, arithmetic Medium 110 mstalker
Temperature Robot case statements, ranges, ranges Elementary 1758
The Curious Case of the Missing Method enumerables, arrays Elementary 2078
The Curious Case of the Missing Method Part 2 enumerables Elementary 1782
The Curious Case of the Missing Method Part 3 methods, enumerables Elementary 882 david
The Curious Case of the Missing Method Part 4 classes Elementary 677 david
The Curious Case of the Missing Method Part 5 arrays Elementary 626 david
The Gray Area booleans Easy 237 david
The Limits of Probability arithmetic, probability, rand Elementary 848 david
The Little Hash Key that Could hash Easy 682 jmpeck
The Traveling Salesman genetic programming Medium 45 david
There's No Way This Works strings Elementary 1581 david
Transpose Me matrices Medium 35 Mason
Traversing a Hash hashes Medium 135 david
Validating Credit Card Numbers strings, enumerables Medium 123 irkenInvader
What's Your Area of Expertise objects, geometry Easy 539 RubyRedRick
Your Favorite and Mine, Fibonacci! arithmetic Easy 703
Random Boolean rand, booleans Easy 402 znz
The Lambda Lambda Lambda Fraternity lambdas, procs, ruby 1.9 Easy 499
Ternary Operator operators, ternary operators Elementary 974 david
Unidentified X Object strings, operators Easy 218 masassiez
Or Equal operators Elementary 1394 david
There's No Way This Works Version 2 strings Elementary 1378 david
Home on the Range ranges Elementary 1308
Version Sort arrays Medium 59 znz