Title Tags Difficulty Solutions Submitter
&& Versus And operators, presidence Elementary 1550 david
A Man, A Plan, A Canal--Panama! strings Easy 320
Alternate Array Notation arrays Elementary 1166 david
An Unconventional Join rails, join, arrays, strings Easy 107 david
Architecting a Solution structs, classes Easy 275 david
Array Item Removal arrays Elementary 1422 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 710
Battleship arithmetic, rand, game Medium 68 tarvit
Bigger element array Elementary 489 rinaldifonseca
Blackjack arithmetic, splat operator Elementary 1978
Brackets and Searches strings Elementary 1243 david
Caution Case case statements, ranges Elementary 1061 masassiez
Class Test object-oriented programming, classes Easy 834 david
Constant Rule constant Easy 614 usa
Counting Elements in Array arrays Easy 267 lucascaton
Default Encoding encoding Elementary 588 znz
Defined? Or not? Object, defined? Elementary 873 lucascaton
Defusing a Bomb nil, exceptions Easy 335 david
Each With Object ruby 1.9, enumerables Easy 525 david
Fixing Bad Code the Wrong Way method_missing, classes Easy 366
FizzBuzz arithmetic, strings Elementary 2309
Generating Random Numbers rand Easy 766 david
Getters and Setters classes Elementary 1159 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 3026
I Put Some S-Expressions in Your Ruby s-expressions, functional programming Medium 60 david
Implement a Hash With Indifferent Access hashes, classes Easy 161 david
Implement Array#abbrev arrays, hash Medium 53 znz
Implement Array#duplicates arrays Medium 88 david
Implement Array#each enumerables Medium 156 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 677 david
Injected and Rejected arithmetic, enumerables Elementary 1608
Introduction to Regular Expressions strings, regular expressions Easy 581
The Truth booleans Elementary 3425
Join URL params url, params Easy 242 lucascaton
Like a Snowflake arrays Medium 122 david
Keep Our Parks Clean! metaprogramming Medium 114 kbennoune
Map enumerables Elementary 2533
Mason's Spades Problem probability, arithmetic Hard 9
Maximum numbers Elementary 2780
Method Acting methods, metaprogramming Easy 583 david
Module Inheritance modules, classes, object-oriented programming Medium 95 kbennoune
Nil Values nil, booleans Elementary 2697
No Limit strings Elementary 793 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 527 david
Picking Lottery Numbers arrays Easy 633 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 893
Redefining Splat splat operator, unary, asterik Easy 118 shugo
Regular Expressions Revisted regular expressions, strings, arrays Medium 102
Reverse strings Elementary 3053
Reverse Array Using For arrays, for, loops Medium 87 shugo
Reverse Each Word strings, enumerables Easy 941
Select Map enumerables, procs Easy 128 masassiez
Separating Numbers with Commas strings, regular expressions Easy 462 naruse
Set Intersection arrays Elementary 1214 znz
Shortest Path Hard 24 Mason
Shotgun Assignment variables Elementary 518 pelargir
Simple String Substitution strings Easy 145 david
Something Doesn't Add Up arithmetic Medium 284 dghopkins
Subtracting Out The Sugar arithmetic Elementary 1300 david
Sum of Primes sum, enumerables, primes, arithmetic Medium 110 mstalker
Temperature Robot case statements, ranges, ranges Elementary 1769
The Curious Case of the Missing Method enumerables, arrays Elementary 2090
The Curious Case of the Missing Method Part 2 enumerables Elementary 1793
The Curious Case of the Missing Method Part 3 methods, enumerables Elementary 886 david
The Curious Case of the Missing Method Part 4 classes Elementary 681 david
The Curious Case of the Missing Method Part 5 arrays Elementary 630 david
The Gray Area booleans Easy 237 david
The Limits of Probability arithmetic, probability, rand Elementary 852 david
The Little Hash Key that Could hash Easy 685 jmpeck
The Traveling Salesman genetic programming Medium 45 david
There's No Way This Works strings Elementary 1589 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 542 RubyRedRick
Your Favorite and Mine, Fibonacci! arithmetic Easy 706
Random Boolean rand, booleans Easy 406 znz
The Lambda Lambda Lambda Fraternity lambdas, procs, ruby 1.9 Easy 501
Ternary Operator operators, ternary operators Elementary 981 david
Unidentified X Object strings, operators Easy 219 masassiez
Or Equal operators Elementary 1402 david
There's No Way This Works Version 2 strings Elementary 1386 david
Home on the Range ranges Elementary 1313
Version Sort arrays Medium 59 znz