# Problems

Title | Tags | Difficulty | Solutions | Submitter |
---|---|---|---|---|

&& Versus And | operators, presidence | Elementary | 1509 | david |

A Man, A Plan, A Canal--Panama! | strings | Easy | 315 | |

Alternate Array Notation | arrays | Elementary | 1139 | david |

An Unconventional Join | rails, join, arrays, strings | Easy | 107 | david |

Architecting a Solution | structs, classes | Easy | 272 | david |

Array Item Removal | arrays | Elementary | 1385 | 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 | 694 | |

Battleship | arithmetic, rand, game | Medium | 68 | tarvit |

Bigger element | array | Elementary | 474 | rinaldifonseca |

Blackjack | arithmetic, splat operator | Elementary | 1928 | |

Brackets and Searches | strings | Elementary | 1214 | david |

Caution Case | case statements, ranges | Elementary | 1033 | 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 | 853 | 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 | 2255 | |

Generating Random Numbers | rand | Easy | 753 | david |

Getters and Setters | classes | Elementary | 1132 | 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 | 2956 | |

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 | 1568 | |

Introduction to Regular Expressions | strings, regular expressions | Easy | 570 | |

The Truth | booleans | Elementary | 3344 | |

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 | 2472 | |

Mason's Spades Problem | probability, arithmetic | Hard | 9 | |

Maximum | numbers | Elementary | 2717 | |

Method Acting | methods, metaprogramming | Easy | 569 | david |

Module Inheritance | modules, classes, object-oriented programming | Medium | 94 | kbennoune |

Nil Values | nil, booleans | Elementary | 2633 | |

No Limit | strings | Elementary | 778 | 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 | 873 | |

Redefining Splat | splat operator, unary, asterik | Easy | 117 | shugo |

Regular Expressions Revisted | regular expressions, strings, arrays | Medium | 102 | |

Related keys of Hash | hashes | Easy | 351 | naruse |

Reverse | strings | Elementary | 2975 | |

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 | 1184 | 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 | 1274 | david |

Sum of Primes | sum, enumerables, primes, arithmetic | Medium | 109 | mstalker |

Temperature Robot | case statements, ranges, ranges | Elementary | 1721 | |

The Curious Case of the Missing Method | enumerables, arrays | Elementary | 2042 | |

The Curious Case of the Missing Method Part 2 | enumerables | Elementary | 1749 | |

The Curious Case of the Missing Method Part 3 | methods, enumerables | Elementary | 866 | 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 | 836 | david |

The Little Hash Key that Could | hash | Easy | 674 | jmpeck |

The Traveling Salesman | genetic programming | Medium | 45 | david |

There's No Way This Works | strings | Elementary | 1549 | 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 | 528 | 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 | 954 | david |

Unidentified X Object | strings, operators | Easy | 216 | masassiez |

Or Equal | operators | Elementary | 1365 | david |

There's No Way This Works Version 2 | strings | Elementary | 1351 | david |

Home on the Range | ranges | Elementary | 1285 | |

Version Sort | arrays | Medium | 59 | znz |