fun with procs, blocks, and lambdas

gistfile1.rb

def a
  [1,2,3].each do |x|
    return :a if x == 2
  end
  :not_a
end

def a2
  block = lambda { |x| return :a if x == 2 }
  [1,2,3].each(&block)
end

def a3
  block = Proc.new { |x| return :a if x == 2 }
  [1,2,3].each(&block)
end

def ab1
  last = nil
  [1,2,3].each do |x|
    last = x
    break if x == 2
  end
  last
end

def ab2
  last = nil
  block = lambda do |x|
    last = x
    break if x == 2
  end
  [1,2,3].each(&block)
  last
end

def ab3
  return :ab3
  last = nil
  block = Proc.new do |x|
    last = x
    break if x == 2
  end
  [1,2,3].each(&block)
  last
end

def b
  [1,2,3].map do |x|
    return :b if x == 2
  end
  :not_b
end

def c
  File.open(__FILE__) do |f|
    return :c
  end
  :not_c
end

def d
  d1 { return :d }
end

def d1(&block)
  x = Object.new
  x.instance_variable_set(:@block, block)
  def x.inspect
    @block.call.inspect
  end
  #x.inspect
end

p a
p a2
p a3
p [ab1, ab2, ab3]
p b
p c
p d