From: "Marcel Molina Jr." <marcel@...>
Date: 2006-03-12T07:50:00+09:00
Subject: Re: from Python to Ruby in 10 seconds

On Sun, Mar 12, 2006 at 07:41:20AM +0900, Logan Capaldo wrote:
> >- With Python, strings and tuples are immutable (for
> >speed, I believe). Does Ruby have immutables like this,
> >or are most object mutable?
> >
> Strings are mutable, symbols, fixnums, floats and bignums are  
> immutable (among others)
> For  the most part if it makes sense that something should be  
> mutable, it is. I don't think that mutability is ever determined on  
> the basis of performance ( except for maybe symbols)
> 
> Ruby doesn't have tuples (If these are the same tuples from ML,  
> etc.). Its array's are mutable.

Any object can be made immutable by freezing it.

>> array = %w(a b c d)
=> ["a", "b", "c", "d"]
>> array << 'e'
=> ["a", "b", "c", "d", "e"]
>> array.freeze
>> array << 'f'
TypeError: can't modify frozen array
        from (irb):3:in `<<'
        from (irb):3

marcel
-- 
Marcel Molina Jr. <marcel@vernix.org>