Rubeque: Unidentified X Object

Couldn’t figure out how to solve this puzzle. Anyone?

http://rubeque.com/problems/unidentified-x-object

On Tue, Jul 31, 2012 at 1:53 PM, Jingjing D. [email protected]
wrote:

Couldn’t figure out how to solve this puzzle. Anyone?

http://rubeque.com/problems/unidentified-x-object

The name of the puzzle is a clue; think of informal names you’ve seen
for some of the Ruby operators.

Let Ruby tell you:

Fixnum.instance_methods.find_all { |op| “X” * 2.send(op,2) == “” rescue
nil}

Then repeat for the other case, and see which operator is common to
both.

Brian C. wrote in post #1070831:

Let Ruby tell you:

Fixnum.instance_methods.find_all { |op| “X” * 2.send(op,2) == “” rescue
nil}

Then repeat for the other case, and see which operator is common to
both.

Good trick. Forgot the spaceship operator returns an integer instead of
a boolean…

On Tue, Jul 31, 2012 at 6:49 PM, Jingjing D. [email protected]
wrote:

Forgot the spaceship operator returns an integer instead of
a boolean…

Booleans don’t have enough values. It has to have something for
greater, less, and equal… and despite repeated appearances on The
Daily WTF (http://thedailywtf.com), FILE_NOT_FOUND is not a valid
Boolean. :slight_smile:

-Dave

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