Title Tags Difficulty Solutions Submitter
&& Versus And operators, presidence Elementary 1508 david
A Man, A Plan, A Canal--Panama! strings Easy 315
Alternate Array Notation arrays Elementary 1138 david
An Unconventional Join rails, join, arrays, strings Easy 107 david
Architecting a Solution structs, classes Easy 271 david
Array Item Removal arrays Elementary 1384 david
Array to Hash arrays, hashes Medium 241 tylera
Architect of SixCity algorithm, math, random, optimization Hard 9 tarvit
Baby Got Stacks classes, stacks Elementary 693
Battleship arithmetic, rand, game Medium 67 tarvit
Bigger element array Elementary 474 rinaldifonseca
Blackjack arithmetic, splat operator Elementary 1927
Brackets and Searches strings Elementary 1213 david
Caution Case case statements, ranges Elementary 1032 masassiez
Class Test object-oriented programming, classes Easy 821 david
Constant Rule constant Easy 602 usa
Counting Elements in Array arrays Easy 260 lucascaton
Default Encoding encoding Elementary 578 znz
Defined? Or not? Object, defined? Elementary 851 lucascaton
Defusing a Bomb nil, exceptions Easy 329 david
Each With Object ruby 1.9, enumerables Easy 512 david
Fixing Bad Code the Wrong Way method_missing, classes Easy 358
FizzBuzz arithmetic, strings Elementary 2254
Generating Random Numbers rand Easy 752 david
Getters and Setters classes Elementary 1131 david
Guess the Sequence math, integers Medium 67 david
Happy Numbers arithmetic Medium 195
Hello? Yes, This Is Dog strings, regular expressions Medium 215
Hello World strings Elementary 2953
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 87 david
Implement Array#each enumerables Medium 155 nilbus2
Implement Array#flatten arrays Medium 134 david
Implement Array#interleave arrays Easy 243 david
Implement Array#transpose arrays Medium 118 znz
Implement Object#try objects, nil Medium 147 david
Implement Shellwords.split strings Medium 44 znz
Including Modules classes, modules Easy 664 david
Injected and Rejected arithmetic, enumerables Elementary 1567
Introduction to Regular Expressions strings, regular expressions Easy 570
The Truth booleans Elementary 3341
Join URL params url, params Easy 238 lucascaton
Like a Snowflake arrays Medium 121 david
Keep Our Parks Clean! metaprogramming Medium 113 kbennoune
Map enumerables Elementary 2471
Mason's Spades Problem probability, arithmetic Hard 9
Maximum numbers Elementary 2715
Method Acting methods, metaprogramming Easy 568 david
Module Inheritance modules, classes, object-oriented programming Medium 94 kbennoune
Nil Values nil, booleans Elementary 2632
No Limit strings Elementary 777 masassiez
One of These is Not Like the Others arrays, classes Medium 141 david
Pack Template UTF-8 pack Easy 132 znz
Pascal's Triangle math, arithmetic Medium 107 david
Phanaeng Curry lambdas, functions, functional programming Elementary 517 david
Picking Lottery Numbers arrays Easy 622 david
Pigs Fly; Wait, No They Don't. exceptions Medium 299
Prime Factorization math, primes, factorization Medium 95 david
Prime Factors arithmetic Medium 157
Quelle Heure Est-Il? dates, strings Easy 142
Queue Continuum classes, queues Elementary 871
Redefining Splat splat operator, unary, asterik Easy 117 shugo
Regular Expressions Revisted regular expressions, strings, arrays Medium 102
Reverse strings Elementary 2972
Reverse Array Using For arrays, for, loops Medium 87 shugo
Reverse Each Word strings, enumerables Easy 926
Select Map enumerables, procs Easy 127 masassiez
Separating Numbers with Commas strings, regular expressions Easy 453 naruse
Set Intersection arrays Elementary 1183 znz
Shortest Path Hard 23 Mason
Shotgun Assignment variables Elementary 505 pelargir
Simple String Substitution strings Easy 143 david
Something Doesn't Add Up arithmetic Medium 280 dghopkins
Subtracting Out The Sugar arithmetic Elementary 1273 david
Sum of Primes sum, enumerables, primes, arithmetic Medium 109 mstalker
Temperature Robot case statements, ranges, ranges Elementary 1720
The Curious Case of the Missing Method enumerables, arrays Elementary 2041
The Curious Case of the Missing Method Part 2 enumerables Elementary 1748
The Curious Case of the Missing Method Part 3 methods, enumerables Elementary 865 david
The Curious Case of the Missing Method Part 4 classes Elementary 667 david
The Curious Case of the Missing Method Part 5 arrays Elementary 619 david
The Gray Area booleans Easy 235 david
The Limits of Probability arithmetic, probability, rand Elementary 835 david
The Little Hash Key that Could hash Easy 673 jmpeck
The Traveling Salesman genetic programming Medium 45 david
There's No Way This Works strings Elementary 1548 david
Transpose Me matrices Medium 34 Mason
Traversing a Hash hashes Medium 134 david
Validating Credit Card Numbers strings, enumerables Medium 122 irkenInvader
What's Your Area of Expertise objects, geometry Easy 527 RubyRedRick
Your Favorite and Mine, Fibonacci! arithmetic Easy 695
Random Boolean rand, booleans Easy 397 znz
The Lambda Lambda Lambda Fraternity lambdas, procs, ruby 1.9 Easy 492
Ternary Operator operators, ternary operators Elementary 953 david
Unidentified X Object strings, operators Easy 216 masassiez
Or Equal operators Elementary 1363 david
There's No Way This Works Version 2 strings Elementary 1349 david
Home on the Range ranges Elementary 1283
Version Sort arrays Medium 59 znz