From: Ruby Quiz Date: 2007-02-10T02:00:03+09:00 Subject: [QUIZ] One-Liners (#113) The three rules of Ruby Quiz: 1. Please do not post any solutions or spoiler discussion for this quiz until 48 hours have passed from the time on this message. 2. Support Ruby Quiz by submitting ideas as often as you can: http://www.rubyquiz.com/ 3. Enjoy! Suggestion: A [QUIZ] in the subject of emails about the problem helps everyone on Ruby Talk follow the discussion. Please reply to the original quiz message, if you can. -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= This week's Ruby Quiz is in pop quiz format. For each of the scenarios below, send in a one line (80 characters or less) solution that performs the task. You may use any legal Ruby syntax including require statements and semicolons, but the goal in finesse more than golfing. Any input described in the problem is in a local variable called quiz. Assigning to this variable is assumed to have happened earlier in the program and is not part of your submitted solution. Your line just needs to evaluate to the expected result. You do not have to store the result in a variable or create any output. Any edge cases not covered by the provided examples are left to your best judgement. * Given a Numeric, provide a String representation with commas inserted between each set of three digits in front of the decimal. For example, 1999995.99 should become "1,999,995.99". * Given a nested Array of Arrays, perform a flatten()-like operation that removes only the top level of nesting. For example, [1, [2, [3]]] would become [1, 2, [3]]. * Shuffle the contents of a provided Array. * Given a Ruby class name in String form (like "GhostWheel::Expression::LookAhead"), fetch the actual class object. * Insert newlines into a paragraph of prose (provided in a String) so lines will wrap at 40 characters. * Given an Array of String words, build an Array of only those words that are anagrams of the first word in the Array. * Convert a ThinkGeek t-shirt slogan (in String form) into a binary representation (still a String). For example, the popular shirt "you are dumb" is actually printed as: 111100111011111110101 110000111100101100101 1100100111010111011011100010 * Provided with an open File object, select a random line of content. * Given a wondrous number Integer, produce the sequence (in an Array). A wondrous number is a number that eventually reaches one, if you apply the following rules to build a sequence from it. If the current number in the sequence is even, the next number is that number divided by two. When the current number is odd, multiply that number by three and add one to get the next number in the sequence. Therefore, if we start with the wondrous number 15, the sequence is [15, 46, 23, 70, 35, 106, 53, 160, 80, 40, 20, 10, 5, 16, 8, 4, 2, 1]. * Convert an Array of objects to nested Hashes such that %w[one two three four five] becomes {"one" => {"two" => {"three" => {"four" => "five"}}}}.