Project Euler in Ruby
I'm taking Bill Wagner up on his Project Euler challenge, but in Ruby. I've secretly wanted to learn Ruby for a long time, and this looks like the perfect chance. So if my code makes your eyes bleed, it's cause I'm a total n00b. Without further ado (because the excitement was becoming unbearable... I agree, Ruby is sexy!), here's my code that prints the answer to Problem 1:
If we list all the natural numbers below 10 that are multiples of 3
or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Find the sum of all the multiples of 3 or 5 below 1000.
answer = (0..999).select { |a| a%3 ==0 || a%5==0 }
puts answer.inject { |sum, n| sum+n }
I love the built-in ruby function inject, which is like foldl in some functional languages. (See a cute demo here.) Overall the code is very similar to Bill's C# version. I wonder if that'll still be the case as we get to the more complex problems.
[4/08/08: correction of a typo in the code]