From: Robert Dober <robert.dober@...>
Date: 2007-05-30T20:58:15+09:00
Subject: Re: Hash behavior query

On 5/30/07, dblack@wobblini.net <dblack@wobblini.net> wrote:
> Hi --
>
> On Wed, 30 May 2007, Abhisek Datta wrote:
>
> > irb(main):001:0> d = [1,2,3,4]
> > => [1, 2, 3, 4]
> > irb(main):002:0> h = Hash.new
> > => {}
> > irb(main):003:0> h[d] = "hello"
> > => "hello"
> > irb(main):004:0> h
> > => {[1, 2, 3, 4]=>"hello"}
> > irb(main):005:0> h[d]
> > => "hello"
> > irb(main):006:0> d.push(5)
> > => [1, 2, 3, 4, 5]
> > irb(main):007:0> h[d]
> > => nil
> > irb(main):008:0> h
> > => {[1, 2, 3, 4, 5]=>"hello"}
> > irb(main):009:0> d
> > => [1, 2, 3, 4, 5]
> > irb(main):010:0> h[d]
> > => nil
> > irb(main):011:0> h.rehash
> > => {[1, 2, 3, 4, 5]=>"hello"}
> > irb(main):012:0> h[d]
> > => "hello"
> > irb(main):013:0>
> >
> >
> > Is this expected or a bug?
>
> You've pretty much reproduced the documented example from the source
> code, so I'd say it's expected :-)
... and furthermore was there not somebody asking whether to prefer
Strings or Symbols as hash keys.
I think the example above gives you some hints, -- sometimes Strings
are still a good choice, but only sometimes.

Cheers
Robert



-- 
You see things; and you say Why?
But I dream things that never were; and I say Why not?
-- George Bernard Shaw