Title Tags Difficulty Solutions Submitter
&& Versus And operators, presidence Elementary 1505 david
A Man, A Plan, A Canal--Panama! strings Easy 314
Alternate Array Notation arrays Elementary 1136 david
An Unconventional Join rails, join, arrays, strings Easy 107 david
Architecting a Solution structs, classes Easy 271 david
Array Item Removal arrays Elementary 1381 david
Array to Hash arrays, hashes Medium 240 tylera
Architect of SixCity algorithm, math, random, optimization Hard 9 tarvit
Baby Got Stacks classes, stacks Elementary 692
Battleship arithmetic, rand, game Medium 67 tarvit
Bigger element array Elementary 472 rinaldifonseca
Blackjack arithmetic, splat operator Elementary 1921
Brackets and Searches strings Elementary 1210 david
Caution Case case statements, ranges Elementary 1030 masassiez
Class Test object-oriented programming, classes Easy 818 david
Constant Rule constant Easy 601 usa
Counting Elements in Array arrays Easy 259 lucascaton
Default Encoding encoding Elementary 577 znz
Defined? Or not? Object, defined? Elementary 849 lucascaton
Defusing a Bomb nil, exceptions Easy 327 david
Each With Object ruby 1.9, enumerables Easy 510 david
Fixing Bad Code the Wrong Way method_missing, classes Easy 357
FizzBuzz arithmetic, strings Elementary 2243
Generating Random Numbers rand Easy 748 david
Getters and Setters classes Elementary 1129 david
Guess the Sequence math, integers Medium 67 david
Happy Numbers arithmetic Medium 194
Hello? Yes, This Is Dog strings, regular expressions Medium 212
Hello World strings Elementary 2940
I Put Some S-Expressions in Your Ruby s-expressions, functional programming Medium 60 david
Implement a Hash With Indifferent Access hashes, classes Easy 158 david
Implement Array#abbrev arrays, hash Medium 52 znz
Implement Array#duplicates arrays Medium 86 david
Implement Array#each enumerables Medium 154 nilbus2
Implement Array#flatten arrays Medium 133 david
Implement Array#interleave arrays Easy 242 david
Implement Array#transpose arrays Medium 117 znz
Implement Object#try objects, nil Medium 145 david
Implement Shellwords.split strings Medium 44 znz
Including Modules classes, modules Easy 662 david
Injected and Rejected arithmetic, enumerables Elementary 1562
Introduction to Regular Expressions strings, regular expressions Easy 569
The Truth booleans Elementary 3326
Join URL params url, params Easy 237 lucascaton
Like a Snowflake arrays Medium 120 david
Keep Our Parks Clean! metaprogramming Medium 111 kbennoune
Map enumerables Elementary 2461
Mason's Spades Problem probability, arithmetic Hard 9
Maximum numbers Elementary 2705
Method Acting methods, metaprogramming Easy 564 david
Module Inheritance modules, classes, object-oriented programming Medium 93 kbennoune
Nil Values nil, booleans Elementary 2622
No Limit strings Elementary 776 masassiez
One of These is Not Like the Others arrays, classes Medium 138 david
Pack Template UTF-8 pack Easy 132 znz
Pascal's Triangle math, arithmetic Medium 105 david
Phanaeng Curry lambdas, functions, functional programming Elementary 515 david
Picking Lottery Numbers arrays Easy 619 david
Pigs Fly; Wait, No They Don't. exceptions Medium 297
Prime Factorization math, primes, factorization Medium 94 david
Prime Factors arithmetic Medium 156
Quelle Heure Est-Il? dates, strings Easy 142
Queue Continuum classes, queues Elementary 870
Redefining Splat splat operator, unary, asterik Easy 117 shugo
Regular Expressions Revisted regular expressions, strings, arrays Medium 101
Reverse strings Elementary 2959
Reverse Array Using For arrays, for, loops Medium 86 shugo
Reverse Each Word strings, enumerables Easy 922
Select Map enumerables, procs Easy 127 masassiez
Separating Numbers with Commas strings, regular expressions Easy 452 naruse
Set Intersection arrays Elementary 1181 znz
Shortest Path Hard 23 Mason
Shotgun Assignment variables Elementary 502 pelargir
Simple String Substitution strings Easy 143 david
Something Doesn't Add Up arithmetic Medium 279 dghopkins
Subtracting Out The Sugar arithmetic Elementary 1271 david
Sum of Primes sum, enumerables, primes, arithmetic Medium 107 mstalker
Temperature Robot case statements, ranges, ranges Elementary 1715
The Curious Case of the Missing Method enumerables, arrays Elementary 2033
The Curious Case of the Missing Method Part 2 enumerables Elementary 1742
The Curious Case of the Missing Method Part 3 methods, enumerables Elementary 864 david
The Curious Case of the Missing Method Part 4 classes Elementary 664 david
The Curious Case of the Missing Method Part 5 arrays Elementary 618 david
The Gray Area booleans Easy 234 david
The Limits of Probability arithmetic, probability, rand Elementary 834 david
The Little Hash Key that Could hash Easy 670 jmpeck
The Traveling Salesman genetic programming Medium 45 david
There's No Way This Works strings Elementary 1543 david
Transpose Me matrices Medium 34 Mason
Traversing a Hash hashes Medium 133 david
Validating Credit Card Numbers strings, enumerables Medium 120 irkenInvader
What's Your Area of Expertise objects, geometry Easy 525 RubyRedRick
Your Favorite and Mine, Fibonacci! arithmetic Easy 693
Random Boolean rand, booleans Easy 395 znz
The Lambda Lambda Lambda Fraternity lambdas, procs, ruby 1.9 Easy 490
Ternary Operator operators, ternary operators Elementary 951 david
Unidentified X Object strings, operators Easy 216 masassiez
Or Equal operators Elementary 1360 david
There's No Way This Works Version 2 strings Elementary 1346 david
Home on the Range ranges Elementary 1281
Version Sort arrays Medium 59 znz