Ruby 匿名函式

yield用法

在方法中使用yield來執行匿名函式

def call_block
    puts "start"
    yield
    yield
    puts "end"
end
# call_block {puts "blocks is cool"}
call_block do
    puts "blocks is cool"
end

帶引數的code block

def call_block
    yield(1)
    yield("jelly")
end

call_blcok do |x|
puts "#{x} hello"
end

將匿名函式轉成類

def call_block(&block)
  block.call(1)
  block.call(2)
end

call_block do |x|
    puts "#{x}: cool"
end

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