At Wed, 29 Sep 1999 12:29:44 +0900,
matz / netlab.co.jp (Yukihiro Matsumoto) wrote:

> How about:
> |	x.gsub!(/(\w)\.(\w)/) { i, j = $~; ... }

What causes the difference below?
The only difference is whether the assignment is done one-by-one or not.

First, I tried this:

x = 'a.b c.d'
x.gsub!(/(\w)\.(\w)/) {
  i, j, k = $~
  print "#{i}, #{j}, #{k}\n"
  j, k = 'zzz', 'ZZZ'
}
p x

=>
a.b, a, b
c.d, c, d
"zzzZZZ zzzZZZ"

Next, I tried this:

x = 'a.b c.d'
x.gsub!(/(\w)\.(\w)/) {
  i, j, k = $~
  print "#{i}, #{j}, #{k}\n"
  j = 'zzz'
  k = 'ZZZ'
}
p x

=>
a.b, a, b
c.d, c, d
"ZZZ ZZZ"

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