From: Brian Ross <p.brian.ross@...>
Date: 2008-08-29T02:12:07+09:00
Subject: Writing a method to handle a code block?

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From Beginning Ruby:

def each_vowel(&code_block)
  %w{a e i o u}.each { |vowel| code_block.call(vowel) }
end
each_vowel { |vowel| puts vowel }

I am trying to figure out how that works but I'm still having a bit of
trouble. Could someone break it down bit by bit to show what it's doing?

def each_vowel(&code_block)

It defines a method that takes a code block (is the & necessary?). What does
it mean to have a method that takes a code block?

  %w{a e i o u}.each { |vowel| code_block.call(vowel) }

Then it takes an array of vowels, which call the each method to pass each
one into the following block through |vowel| as a block argument. The block
arguments are then called by the variable code_block (I don't understand
this).

Brian

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