On Wed, Dec 22, 2010 at 1:14 PM, Benny Tsai <benny.t...@gmail.com> wrote:
> Hi Ken,
>
>> user=> (let [[x y & more] [1 2 3 4 5]] [x y more])
>> [1 2 (3 4 5)]
>> user=> (let [[x y z] [1 2 3 4 5]] [x y z])
>> [1 2 3]
>> user=> (let [[_ _ a b] [1 2 3 4 5]] [a b])
>> [3 4]
>>
>> You can grab any fixed position in this way, as well as a "rest" that
>> is the tail of the sequence past the last of such.
>
> Right, that's true. However, Marek had given two examples of Python
> tuple unpacking, the first being:
>
>> first, *middle, last = sequence(...)
>
> Which I believe in Python 3 will bind 'first' to the first element,
> 'last' to the last element, and 'middle' to a sequence of all the
> elements in the middle. That last part is what I don't know how to do
> in Clojure.
I don't think Clojure has that. Closest is
(let [[f & rst] [1 2 3 4 5]
l (last rst)
m (butlast rst)]
[f m l])
Output is [1 (2 3 4) 5]
Obviously, using the last element is non-lazy. It may well be that in
cases where you'd want to do this you might prefer another data
representation.
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
