,我不是做以下行爲的意義,得到(見in this SO thread):在一個匿名塊
def def_test
puts 'def_test.in'
yield if block_given?
puts 'def_test.out'
end
def_test do
puts 'def_test ok'
end
block_test = proc do |&block|
puts 'block_test.in'
block.call if block
puts 'block_test.out'
end
block_test.call do
puts 'block_test'
end
proc_test = proc do
puts 'proc_test.in'
yield if block_given?
puts 'proc_test.out'
end
proc_test.call do
puts 'proc_test ok'
end
輸出:
def_test.in
def_test ok
def_test.out
block_test.in
block_test ok
block_test.out
proc_test.in
proc_test.out
我不介意訴諸明確聲明&塊變量,並直接調用它,但我更想理解爲什麼我最終需要。
相關:http://stackoverflow.com/questions/6628936/extending-a-class-method-in-a-module –