From: Michael Chow <nanostuff@...>
Date: 2007-10-22T09:45:50+09:00
Subject: gsub does not work with do/end block, only brackets

puts "abcdefg".gsub(/abc/) do |x|
  x.upcase
end

^This does not work. ArgumentError, it's expecting the second argument
that's required when a block is not provided.

puts "abcdefg".gsub(/abc/) { |x|
  x.upcase
}

^This works.

Why??
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