hello_loop.rb

#!/usr/bin/env ruby

def hello_loop(names)
  names.each do |name|
    puts "Hello #{name}"
  end
end

hello_loop(%w(
  Gafitescu
  D_Roch
  Steven_Ng
  n0x13
  hosheng
  Pratik_Desal
  r_kumar
  Ashley_Moran
  persiancoffee
  Andre_Fischer))
# Notice how %w will delimit on space, so names will have to have _.

# Some other tricks

puts %w(
  Gafitescu
  D_Roch
  Steven_Ng
  n0x13
  hosheng
  Pratik_Desal
  r_kumar
  Ashley_Moran
  persiancoffee
  Andre_Fischer).map { |name| "Hello #{name}" }

# Splat operator some of the commentators were talking about
def say_hello!(*names)
  puts names.map {|name| "Hello #{name}" }
end

say_hello!("Gafitescu", "D_Roch", "Steven_Ng","n0x13")

# Someone in the comments mentioned adding a #to_hello, but the example
# was incomplete. You have to reopen the Array class (yes, after it has been
# defined) and add the to_hello method.
class Array
  def to_hello
    self.map { |i| "Hello #{name}" }
  end
end

puts %w(
  Gafitescu
  D_Roch
  Steven_Ng
  n0x13
  hosheng
  Pratik_Desal
  r_kumar
  Ashley_Moran
  persiancoffee
  Andre_Fischer).to_hello

# To keep things more organized, projects such as Rails or Merb will
# have core extensions separated out into namespaced modules and then
# including them into the the array.
module MyNamespace
  module CoreExt
    module Array
      def say(something = "Hello")
        self.map { |i| "#{something} #{name}" }
      end
    end
  end
end

class Array
  include MyNamespace::CoreExt::Array
end

# Or a shorter way:

Array.send(:include, MyNamespace::CoreExt::Array)

puts %w(
  Gafitescu
  D_Roch
  Steven_Ng
  n0x13
  hosheng
  Pratik_Desal
  r_kumar
  Ashley_Moran
  persiancoffee
  Andre_Fischer).say("Ni Hao,")

# I highly recommend playing with irb since you can do things like
# [].methods.sort to inspect what you can call. Same with
# {}.methods.sort
# You don't always need to drop this into a file.