Truncate an array / list?

[dw]

Silly question, but I'm wondering what the best way is to remove the
first N elements of an array or list. I didn't see anything obvious
in the docs.

Cheers,

David

[Brandon Gresham]

You could use java's ArrayList...

ArrayList.removeRange( 0, N )

For arrays, you could massage to an ArrayList first...

var arrayList = Arrays.asList( myArray ) as ArrayList

Cheers,

David

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[Carson Gross]

On List, the subList() method returns a "view" of the larger list, so modifications will percolate through to it:

  http://download.oracle.com/javase/1.4.2/docs/api/java/util/List.html#subList(int,%20int)

  var myList = {"a", "b", "c}

  myList.subList( 0, 2 ).clear()

  print( myList ) // prints ["c"]

Cheers,

Carson

[Y Tso-Guillen]

If you don't care to mutate the list in any way, you can try this:

var myList = {"a", "b", "c", "d", "e", "f", "g"}
return myList.listIterator(4).toList()

which yields {"e", "f", "g"} as a new list.

Y

On Dec 9, 10:26 am, Carson Gross <carsongr...@gmail.com> wrote:
> On List, the subList() method returns a "view" of the larger list, so
> modifications will percolate through to it:
>

> http://download.oracle.com/javase/1.4.2/docs/api/java/util/List.html#...)

>
>   var myList = {"a", "b", "c}
>   myList.subList( 0, 2 ).clear()
>   print( myList ) // prints ["c"]
>
> Cheers,
> Carson
>

> On Thu, Dec 9, 2010 at 6:47 AM, Brandon Gresham <bran...@thegreshams.net>wrote:
>
>
>
>
>
>
>
> > You could use java's ArrayList...
>
> >        ArrayList.removeRange( 0, N )
>
> > For arrays, you could massage to an ArrayList first...
>
> >        var arrayList = Arrays.asList( myArray ) as ArrayList
>
> > -----Original Message-----
> > From: gosu...@googlegroups.com [mailto:gosu...@googlegroups.com] On
> > Behalf Of dw
> > Sent: Thursday, December 09, 2010 12:51 AM
> > To: gosu-lang
> > Subject: [gosu-lang:187] Truncate an array / list?
>
> > Silly question, but I'm wondering what the best way is to remove the
> > first N elements of an array or list.  I didn't see anything obvious
> > in the docs.
>
> > Cheers,
>
> > David
>
> > --
> > You received this message because you are subscribed to the Google Groups
> > "gosu-lang" group.
> > To post to this group, send email to gosu...@googlegroups.com.
> > To unsubscribe from this group, send email to

> > gosu-lang+...@googlegroups.com<gosu-lang%2Bunsubscribe@googlegroups .com>
> > .

> > For more options, visit this group at
> >http://groups.google.com/group/gosu-lang?hl=en.
>
> > --
> > You received this message because you are subscribed to the Google Groups
> > "gosu-lang" group.
> > To post to this group, send email to gosu...@googlegroups.com.
> > To unsubscribe from this group, send email to

> > gosu-lang+...@googlegroups.com<gosu-lang%2Bunsubscribe@googlegroups .com>
> > .

[Brandon Gresham]

I guess the point being driven home is that the kewlness of Gosu allows you to just use a standard-java approach whenever Gosu doesn't provide the functionality.

;)

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[Carson Gross]

Exactly.  A good algorithm to use when asking "How do I do this in Gosu?" is:

  How do I do this in Java?  Is it insane?  

  If yes, Gosu probably offers a better alternative (e.g. File#read() )

  If no, the Java way is probably the right way

;)

Cheers,
Carson

[Brandon Gresham]

Yeah, File#read() is quite awesome.  Even the gosu-anti-fanboys where I work (because they are just *-anti-fanboys, nothing specifically against Gosu) were very pleased to see that feature.