Blocks, Procs and Lambda - Oh My!

lambda.rb

def test_lambda
  puts "About to call lambda"
  blck = lambda do
    puts " -- Start lambda"
    return "lambda"
    puts " -- End lambda"
  end
  val = blck.call
  puts "The value is #{val}"
  puts "Just called lambda"
end

test_lambda

proc.rb

def test_proc
  puts "About to call proc"
  blck = proc do
    puts " -- Start proc"
    return "proc"
    puts " -- End proc"
  end
  val = blck.call
  puts "The value is #{val}"
  puts "Just called proc"
end

test_proc

proc_object.rb

def test_proc_object
  puts "About to call Proc.new"
  blck = Proc.new do
    puts " -- Start Proc.new"
    return "Proc.new"
    puts " -- End Proc.new"
  end
  val = blck.call
  puts "The value is #{val}"
  puts "Just called Proc.new"
end

test_proc_object

test_all.rb

# Try running on Ruby 1.8.7 and 1.9.3

puts "Blocks, Procs and Lambdas, Oh My!\n\n"

require "lambda"

puts "\n\n"

require "proc"

puts "\n\n"

require "proc_object"