Title Tags Difficulty Solutions Submitter
&& Versus And operators, presidence Elementary 1579 david
A Man, A Plan, A Canal--Panama! strings Easy 327
Alternate Array Notation arrays Elementary 1187 david
An Unconventional Join rails, join, arrays, strings Easy 111 david
Architecting a Solution structs, classes Easy 281 david
Array Item Removal arrays Elementary 1448 david
Array to Hash arrays, hashes Medium 248 tylera
Architect of SixCity algorithm, math, random, optimization Hard 10 tarvit
Baby Got Stacks classes, stacks Elementary 719
Battleship arithmetic, rand, game Medium 68 tarvit
Bigger element array Elementary 497 rinaldifonseca
Blackjack arithmetic, splat operator Elementary 2014
Brackets and Searches strings Elementary 1262 david
Caution Case case statements, ranges Elementary 1081 masassiez
Class Test object-oriented programming, classes Easy 845 david
Constant Rule constant Easy 623 usa
Counting Elements in Array arrays Easy 275 lucascaton
Default Encoding encoding Elementary 597 znz
Defined? Or not? Object, defined? Elementary 888 lucascaton
Defusing a Bomb nil, exceptions Easy 341 david
Each With Object ruby 1.9, enumerables Easy 534 david
Fixing Bad Code the Wrong Way method_missing, classes Easy 372
FizzBuzz arithmetic, strings Elementary 2352
Generating Random Numbers rand Easy 776 david
Getters and Setters classes Elementary 1179 david
Guess the Sequence math, integers Medium 67 david
Happy Numbers arithmetic Medium 201
Hello? Yes, This Is Dog strings, regular expressions Medium 222
Hello World strings Elementary 3089
I Put Some S-Expressions in Your Ruby s-expressions, functional programming Medium 61 david
Implement a Hash With Indifferent Access hashes, classes Easy 167 david
Implement Array#abbrev arrays, hash Medium 55 znz
Implement Array#duplicates arrays Medium 91 david
Implement Array#each enumerables Medium 159 nilbus2
Implement Array#flatten arrays Medium 135 david
Implement Array#interleave arrays Easy 251 david
Implement Array#transpose arrays Medium 122 znz
Implement Object#try objects, nil Medium 151 david
Implement Shellwords.split strings Medium 45 znz
Including Modules classes, modules Easy 685 david
Injected and Rejected arithmetic, enumerables Elementary 1634
Introduction to Regular Expressions strings, regular expressions Easy 589
The Truth booleans Elementary 3504
Join URL params url, params Easy 247 lucascaton
Like a Snowflake arrays Medium 124 david
Keep Our Parks Clean! metaprogramming Medium 117 kbennoune
Map enumerables Elementary 2585
Mason's Spades Problem probability, arithmetic Hard 9
Maximum numbers Elementary 2837
Method Acting methods, metaprogramming Easy 591 david
Module Inheritance modules, classes, object-oriented programming Medium 97 kbennoune
Nil Values nil, booleans Elementary 2749
No Limit strings Elementary 803 masassiez
One of These is Not Like the Others arrays, classes Medium 146 david
Pack Template UTF-8 pack Easy 136 znz
Pascal's Triangle math, arithmetic Medium 110 david
Phanaeng Curry lambdas, functions, functional programming Elementary 535 david
Picking Lottery Numbers arrays Easy 640 david
Pigs Fly; Wait, No They Don't. exceptions Medium 305
Prime Factorization math, primes, factorization Medium 98 david
Prime Factors arithmetic Medium 160
Quelle Heure Est-Il? dates, strings Easy 148
Queue Continuum classes, queues Elementary 908
Redefining Splat splat operator, unary, asterik Easy 119 shugo
Regular Expressions Revisted regular expressions, strings, arrays Medium 104
Reverse strings Elementary 3130
Reverse Array Using For arrays, for, loops Medium 87 shugo
Reverse Each Word strings, enumerables Easy 952
Select Map enumerables, procs Easy 129 masassiez
Separating Numbers with Commas strings, regular expressions Easy 470 naruse
Set Intersection arrays Elementary 1235 znz
Shortest Path Hard 25 Mason
Shotgun Assignment variables Elementary 528 pelargir
Simple String Substitution strings Easy 150 david
Something Doesn't Add Up arithmetic Medium 287 dghopkins
Subtracting Out The Sugar arithmetic Elementary 1321 david
Sum of Primes sum, enumerables, primes, arithmetic Medium 113 mstalker
Temperature Robot case statements, ranges, ranges Elementary 1802
The Curious Case of the Missing Method enumerables, arrays Elementary 2130
The Curious Case of the Missing Method Part 2 enumerables Elementary 1826
The Curious Case of the Missing Method Part 3 methods, enumerables Elementary 902 david
The Curious Case of the Missing Method Part 4 classes Elementary 691 david
The Curious Case of the Missing Method Part 5 arrays Elementary 639 david
The Gray Area booleans Easy 243 david
The Limits of Probability arithmetic, probability, rand Elementary 862 david
The Little Hash Key that Could hash Easy 695 jmpeck
The Traveling Salesman genetic programming Medium 45 david
There's No Way This Works strings Elementary 1619 david
Transpose Me matrices Medium 36 Mason
Traversing a Hash hashes Medium 139 david
Validating Credit Card Numbers strings, enumerables Medium 127 irkenInvader
What's Your Area of Expertise objects, geometry Easy 551 RubyRedRick
Your Favorite and Mine, Fibonacci! arithmetic Easy 714
Random Boolean rand, booleans Easy 413 znz
The Lambda Lambda Lambda Fraternity lambdas, procs, ruby 1.9 Easy 509
Ternary Operator operators, ternary operators Elementary 1000 david
Unidentified X Object strings, operators Easy 224 masassiez
Or Equal operators Elementary 1430 david
There's No Way This Works Version 2 strings Elementary 1414 david
Home on the Range ranges Elementary 1337
Version Sort arrays Medium 60 znz