On Mon, 2008-03-10 at 19:50 +0900, Farrel Lifson wrote:
> On 10/03/2008, Frantisek Psotka <frantisek.psotka / matfyz.cz> wrote:
> > is in ruby operator for:
> >
> >  a = b if b
> >
> >  a (operator) b
> 
> a ||= b

Not quite:

irb(main):007:0> a = 1
=> 1
irb(main):008:0> b = 2
=> 2
irb(main):009:0> a ||= b
=> 1
irb(main):010:0> 
irb(main):011:0* a
=> 1
irb(main):012:0> a = b if b
=> 2
irb(main):013:0> a
=> 2

a ||= b is equivalent to a = b if !a, which isn't quite the same thing
as a = b if b.

-- 
Alex