From: Aleks Kissinger <aleks0@...>
Date: 2006-07-26T23:43:37+09:00
Subject: Re: Truncate an array

I'd thought about that too.  This is bad for two reasons.

1. SOME_ARRAY is 'supposedly' a constant, in that ruby complains if
you assign to it more than once.

2. We didn't really truncate the array, just made a new empty one.

SOME_ARRAY = [1,2,3]
a = SOME_ARRAY
SOME_ARRAY = []
p a
=> [1, 2, 3]

As opposed to something like:
a = SOME_ARRAY
SOME_ARRAY.length.times{SOME_ARRAY.shift}
p a
=> []

On 7/26/06, Berger, Daniel <Daniel.Berger@qwest.com> wrote:
> > -----Original Message-----
> > From: Aleks Kissinger [mailto:aleks0@gmail.com]
> > Sent: Wednesday, July 26, 2006 8:31 AM
> > To: ruby-talk ML
> > Subject: Truncate an array
> >
> >
> > Is there a generally preferred way to truncate an array?
> > I've used these two, but is there a better way?
> >
> > SOME_ARRAY = [1, 2, 3]
> >
> > 1. SOME_ARRAY.each_index{|i| SOME_ARRAY[i].nil}.compact!
> > 2. SOME_ARRAY.slice!(1..0)
> >
> > => SOME_ARRAY == []
>
> SOME_ARRAY = []
>
> Regards,
>
> Dan
>
>
>
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