[squeak-dev] Noob question: array slice?
Travis Griggs
travisgriggs at gmail.com
Fri Aug 6 07:08:10 UTC 2010
On Aug 5, 2010, at 11:03 PM, Casey Ransberger wrote:
> Given that I have a collection like #(foo bar baz 1 2 3), and I want
> to get elements 2...4, what selector do I use? I'm confused. Argh.
> Seems like I should be able to figure this out by now without what I
> think of being a pain. I guess I can just test the bounds, but yuck.
#(foo bar baz 1 2 3) copyFrom: 2 to: 4
? is that what what you mean?
another way, more general would be
(2 to: 4) collect: [:n | original at: n]
In VisualWorks 7.7.1, we added a Subsequence object, that can act as a
subrange facade to a sequence. It's very very handy for the Meyer diff
algorithm, and doing Text differencing.
Subsequence sequence: #(foo bar baz 1 2 3) from: 2 to: 4
You can stack them of course.
--
Travis Griggs
Objologist
For every adage, there is an equal and contrary un-adage
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