From: jake kaiden <jakekaiden@...>
Date: 2011-11-26T04:46:42+09:00
Subject: Re: Understanding Ruby blocks

hi Fily,

  the File.open block is really useful, but probably not the easiest way 
to understand how to use blocks...

  think about the Array.each block - when you call Array.each, you then 
define a block of code that will be passed each entry in the array as an 
argument (which you name inside the bars ||)

  array = ["Tom", "Dick", "Harry"]

  array.each do |name|
  puts "Hi " + name
  end

  => Hi Tom
     Hi Dick
     Hi Harry

  ...or...

  array.each do |name|
  puts "Hi " + name unless name == "Dick"
  end

  => Hi Tom
     Hi Harry

  note that you can usually also use curly braces {} instead of the 'do' 
and 'end' keywords...

  array.each{|name|puts "Hi " + name}


  hth -

  j

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