From: Charles Caldwell <lists@...>
Date: 2013-02-16T00:52:21+09:00
Subject: Re: What are lambda functions used for?

I find them useful when I'm writing scripts that automate tasks. I'll 
have many variables and I'll have something I want to do to them over 
and over with only a slight change. I could write a method but then I'll 
have to pass in all the variables which will make for a pretty nasty 
looking parameter list. So, instead, I'll just use a lambda.

roll_over_rows = lambda { |column|
  7.upto(121) do |row|
    # Do some stuff with the data in those rows
    # Insert that data into a new place
    # Do some calculations
  end

  # Update variables with data
  # Put calculation into another place
  excel_file.ws.range("#{column}127").value = some_variable + 
another_variable
}

roll_over_rows['T']
roll_over_rows['C']
# Called several more times

I'm probably breaking some serious design patterns but it is what I 
personally find lambdas useful for.

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