Blocks In-depth: Scope

bypass_gates.rb

a = 1

Foo = Class.new do
  # a == 1 here
  b = 2

  define_method(:bar) do
    # a == 1 here, b == 2 here
    c = 3
  end

  define_method(:baz) do
    # a == 1 here, b == 2 here
    # c is undefined here
    d = 4
  end

  # a == 1 here, b == 2 here
  # c & d are undefined here
end

scope_gates.rb

a = 1

class Foo
  # a is undefined here
  b = 2

  def bar
    # a & b are undefined here
    c = 3
  end

  def baz
    # a, b & c are undefined here
    d = 4
  end

  # a, c & d are undefined here
end

share_scope.rb

class Foo
 def initialize
    @hello = "world"
  end

  def bar
    puts @hello
  end
end