keyword args

keyword.rb

def foo
  :foo
end

def bar(foo = 1)
  p foo #=> 1(2.1.1, 2.2.0)
end

def hoge(foo = foo)
  p foo #=> :foo(2.1.1), nil(2.2.0)
end

def fuga(foo = foo())
  p foo #=> :foo(2.1.1, 2.2.0)
end

bar
hoge
fuga