# "break" from a block and a proc object used in block positio

**URL:** <https://www.ruby-forum.com/t/break-from-a-block-and-a-proc-object-used-in-block-positio/105621>\
**Category:** Ruby\
**Created:** [May 31, 2007, 8:05pm UTC](https://www.ruby-forum.com/t/break-from-a-block-and-a-proc-object-used-in-block-positio/105621 "2007-05-31T20:05:53Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![wonado](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/919ad9/32.png) [@wonado](https://www.ruby-forum.com/u/wonado)\
**Post date:** [May 31, 2007, 8:05pm UTC](https://www.ruby-forum.com/t/break-from-a-block-and-a-proc-object-used-in-block-positio/105621/1 "2007-05-31T20:05:53Z")

</div>

Hi!

In german ruby-forum we had a question which ends up in unclear  
situations. The  
following code:

----- Code -----  
def useblk1  
puts “block (useblk1) returns ‘#{yield}’”  
99  
end  
puts “useblk1 returns ‘#{useblk1 {break 42}}’”

def useblk2(&blk)  
puts “block (useblk2) returns ‘#{blk.call}’”  
99  
end  
puts “useblk2 returns ‘#{useblk2 {break 42}}’”

def useblk3  
puts “block (useblk3) returns ‘#{yield}’”  
99  
end  
puts “useblk3 returns ‘#{useblk3(&lambda{break 42})}’” rescue puts  
“useblk3  
error: #$!”

def useblk4  
puts “block (useblk4) returns ‘#{yield}’”  
99  
end  
puts “useblk4 returns ‘#{useblk4(&Proc.new{break 42})}’” rescue puts  
“useblk4  
error: #$!”  
----- End of Code -----

results under Ruby 1.8.6 (OneClickInstaller-186-25) in:

----- Result Ruby 1.8.6 -----  
useblk1 returns ‘42’  
useblk2 returns ‘42’  
useblk3 error: break from proc-closure  
useblk4 error: break from proc-closure  
----- End of Result -----

Which surprises me. When I read “PickAxe2” all should return from the  
method  
with the value presented by “break”.

When I run this Program with Ruby 1.9 (MSYS/MinGW build on Windows2000,  
2007-05-15 patchlevel 0) the result is the following:

----- Result Ruby 1.9 -----  
useblk1 returns ‘42’  
block (useblk2) returns ‘42’  
useblk2 returns ‘99’  
useblk3 returns ‘42’  
useblk4 returns ‘42’  
----- End of Result -----

Here I’m confused by the result of “useblk2”, but the rest is clear for  
me.

Did I make an error? - Are there Errors in 1.8.6? - Are there Errors in  
1.9? - ???

I must admit that I am confused…

Wolfgang Nádasi-Donner