From: Mike Gold <mike.gold.4433@...>
Date: 2009-01-28T09:21:39+09:00
Subject: Re: Conventions in ruby and the principle of least surprise

Ryan Davis wrote:
> On Jan 27, 2009, at 02:08 , Damjan Rems wrote:
> 
>> My convention is use {} in oneliners. In all other examples I use
>> do..end.
> 
> I follow (and teach) the weirich method:
> 
>    http://onestepback.org/index.cgi/Tech/Ruby/BraceVsDoEnd.rdoc
> 
> {} for block values I care about (think map), do/end for regular block
> sends (think each).
> 
> I use {} for blocks that return values (think #map) and do/end for all
> other blocks (think #each).

funcs = []
(1..5).each do |i|
  funcs << lambda { i }
end
p funcs.map { |f| f.call }   # => [1, 2, 3, 4, 5]

funcs2 = []
for j in 1..5
  funcs2 << lambda { j }
end
p funcs2.map { |f| f.call }   # => [5, 5, 5, 5, 5]

I prefer to make the new binding scope of a block visually obvious, 
therefore I always use {}.  do/end tricks me into thinking it belongs to 
the same category as for/end or while/end or if/end, but it's quite 
different (above).

Also, I like one rule better than two rules.
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