Methods returning symbols is nice

method_objects.rb

foo = method def foo
  def a(num)
    3 * num.to_i
  end

  n = yield if block_given?
  a(n || 3)
rescue
  "oops!"
end

def foo.bar(num)
  a(num)
end

require 'minitest/autorun'
describe "foo" do
  it "should be a method object" do
    foo.class.must_equal Method
  end

  it "should also be a method (if parens are used)" do
    foo().must_equal 9
  end

  it "should return 9 when called with no block" do
    foo.call.must_equal 9
  end

  it "should return block value * 3 when called with a block" do
    foo.call{2}.must_equal 6
  end

  it "should be callable with block with parens too" do
    foo(){2}.must_equal 6
  end

  it "should rescue when given a naughty block" do
    foo.call{ raise "blam!" }.must_equal "oops!"
  end

  it "should expose foo's a method as bar" do
    foo.bar(5).must_equal 15
  end
end