From: Jeff Peng <jeffpeng@...>
Date: 2009-12-30T21:00:35+09:00
Subject: Re: How to pass a function as parameter?

Jes�s Gabriel y Gal�n:
> On Wed, Dec 30, 2009 at 12:42 PM, Fritz Trapper <ajfrenzel@web.de> wrote:
>> I want to pass a reference to function as parameter to another function
>> and execute the passed function. Somthing like this:
>>
>> def executer(func)
>>   func(1)
>> end
>>
>> def test(x)
>>   p x
>> end
>>
>> executer(test)
>>
>> How to write this correctly in ruby?
> 
> A typical way would be using blocks or procs:
> 
> def executer
> yield 1
> end
> 
> executer {|x| puts "I got #{x}"}
> 
> If you want something to handle around in a variable:
> 
> func = lambda {|x| puts "I got #{x}"}
> executer(&func) # => I got 1
> 

for &func, what's the "&" before "func" here?

Thanks.