[Boulder Ruby Group] Fwd: Ruby 1.9 block scope change

[Tim Pease]

On Feb 28, 2008, at 11:21 AM, Robert Campbell wrote:

> Forwarding this message from a friend on Santa Barbara's Ruby list...
>
>
> Begin forwarded message:
>
>> From: "P. Mark Anderson" <wayoutwest at gmail.com>
>> Date: February 28, 2008 10:25:41 AM MST
>> To: "Kyle Campos" <kcampos at bioiq.com>, "Aaron Campos" <acampos at bioiq.com 
>> >,  "Sean Porter" <sean at ideanode.com>, sbonrails at googlegroups.com,   
>> "David Torres" <dtorres at bioiq.com>
>> Subject: Ruby 1.9 block scope change
>> Reply-To: sbonrails at googlegroups.com
>>
>> Rubyists,
>>
>> During this Matz talk at Google I learned that Ruby 1.9 has some new
>> features and many little incompatibilities to be aware of.
>>
>> http://www.youtube.com/watch?v=oEkJvvGEtB4
>>
>> Mark
>>
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>> <local_scope_ruby_19.png>

The image has this bit of text in it ...

x = 15
loop {|x| x = 10; break}
p x    #=> 15

And there is a warning about x being shadowed in the loop.

Because of this, I've started returning values from loops and  
assigning them that way ...

x = 15
x = loop {|x| break 10}
p x    #=> 10

This works in both 1.8 and 1.9  Just a good habit to get into.  If  
you've not played around with ruby1.9 yet, you can follow Bruce  
William's instructions for installing 1.9 alongside 1.8.

<http://www.codefluency.com/articles/2007/12/02/it-s-time-to-play-with-1-9/ 
 >

And I'm sure the talk by Matz is very interesting. Haven't had time to  
watch it yet. Should put that on tomorrow afternoon's schedule.

Blessings,
TwP