Return in blocks


#1

Whats the official word on using return to return a value in a block,
rather than just the value of the last expression?

Using ruby 1.8.2 (2004-12-25) [i386-mswin32] I see strange behaviour (
silent crash ) when explicitly using ‘return’ to return from a block,
yet otherwise the code runs fine.

running under ntsd

eax=74fd5054 ebx=7ffdf000 ecx=0241cdac edx=00000000 esi=77f8dd80
edi=00000000
eip=77f8dd8b esp=0240fe2c ebp=0240fef4 iopl=0 nv up ei pl zr na
po nc
cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000
efl=00000246
ntdll!NtTerminateProcess+b:
77f8dd8b c20800 ret 0x8

Which I can’t interpret as anything in particular.


#2

Hi,

In message “Re: return in blocks”
on Sun, 20 Nov 2005 19:29:40 +0900, Lyndon S.
removed_email_address@domain.invalid writes:

|Whats the official word on using return to return a value in a block,
|rather than just the value of the last expression?

Usually use "break " to pass a value from a block.

|Using ruby 1.8.2 (2004-12-25) [i386-mswin32] I see strange behaviour (
|silent crash ) when explicitly using ‘return’ to return from a block,
|yet otherwise the code runs fine.

Show us a concrete code to reproduce your crash, please, preferably
using more recent version, at least 1.8.3.

						matz.

#3

Lyndon S. a écrit :

Whats the official word on using return to return a value in a block,
rather than just the value of the last expression?

return in a block doesn’t just return the block, it returns the method
where the block has been created.

Exemple:

def my_method
test = [“one”, “two”, “three”]
test.each do |e|
if e == “three”
return “my_method returned”
end
puts e
end
puts “will it ever goes here?”
end

puts my_method

output:

one
two
my_method_returned


Lionel T.

Personal web site: http://users.skynet.be/lthiry/


#4

On 11/21/05, Lionel T. removed_email_address@domain.invalid wrote:

Lyndon S. a écrit :

Whats the official word on using return to return a value in a block,
rather than just the value of the last expression?

return in a block doesn’t just return the block, it returns the method
where the block has been created.

Hence my silence, I’m sure when I check this will turn out to be what
happened.

Apologies for the noise :slight_smile: