Wednesday, December 30, 2009

Don't use return statement in call block

return statement in call block returns from surrounding method instead of returning from call block.

Following code snippet describes it with example.

def function1(&block)

callback_result = yield('value1', 'value2')

puts "call block returned: #{callback_result}"

end

def function2()

function1() do |param1, param2|
puts "block implementation of function2 with param1 => #{param1} & param2 => #{param2}"
return "#{param1} changed. #{param2} changed."
end

puts "next line after calling function1"

return "function2 returned"
end


def function3()

function1() do |param1, param2|
puts "block implementation of function3 with param1 => #{param1} & param2 => #{param2}"
"#{param1} changed. #{param2} changed."
end

puts "next line after calling function1"

return "function3 returned"
end

output of function2() is

block implementation of function2 with param1 => value1 & param2 => value2
"value1 changed. value2 changed."

Output of function3() is

block implementation of function3 with param1 => value1 & param2 => value2
call block returned: value1 changed. value2 changed.
next line after calling function1
"function3 returned"

2 comments:

moinul said...

Brother,

I am working as Senior Engineer in an ISP and responsible for developing and maintaining our company website and internal web applications and some other jobs. Currently I have an assignment to learn Ruby on Rails for managing a web application based on RoR. So I would like to join the seminar you arranged with bdjobs.com on the 23rd January of 2010. As a newbie of RoR I want to have some idea to get started. My interests are:

1. Installing Rails in different OS (Linux & Windows)
2. Choosing the best platform/OS to develop web application using Rails. (As I work in windows platform)
3. And some other things

I sent a mail to rorseminar@bdjobs.com to register me to the seminar though I haven't yet received any reply.

Thank you.

Regards,
Mohammad Moinul Hossain
E-mail: emoinul@gmail.com

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