Is the vector a sequence?

[ru]

Hi,

user=> (seq? [1 2 3 4 5])

false

user=> 

Sincerely,

  Ru

[Alex Miller]

No, vectors are not sequences. They are however "seqable", that is they can provide a sequence when asked...

You might find this helpful:

http://insideclojure.org/2015/01/02/sequences/

[Timothy Baldridge]

It's not a seq, but it's seqable. 

(seq? [1 2]) => false
(seqable? [1 2]) => true
(seq? (seq [1 2])) => true

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[ru]

user=> (seqable? [1 2])

CompilerException java.lang.RuntimeException: Unable to resolve symbol: seqable? in this context, compiling:(/private/var/folders/5j/k0rtjxqn3b57nykc_1jf2xnr0000gn/T/form-init6382892774167052117.clj:1:1) 

user=> 

пятница, 20 апреля 2018 г., 18:35:45 UTC+3 пользователь tbc++ написал:

It's not a seq, but it's seqable. 

(seq? [1 2]) => false
(seqable? [1 2]) => true
(seq? (seq [1 2])) => true

On Fri, Apr 20, 2018 at 9:33 AM, ru <sor...@oogis.ru> wrote:

Hi,

user=> (seq? [1 2 3 4 5])

false

user=> 

Sincerely,

  Ru

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[Timothy Baldridge]

seqable? was added in Clojure 1.9

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[ru]

Thank you, Alex and tbc++

пятница, 20 апреля 2018 г., 18:55:59 UTC+3 пользователь tbc++ написал:

[Rick Moynihan]

It's also worth mentioning vectors are sequential:

(sequential? [1 2 3]) ;; => true

R.

[Alexander Yakushev]

You might also want to check this: http://bytopia.org/2016/03/08/what-is-a-list/

[Peter Hull]

On Friday, 20 April 2018 22:39:41 UTC+1, Rick Moynihan wrote:

It's also worth mentioning vectors are sequential:

I'd be interested to know what is the purpose of sequential. The docs for sequential? just say it implements Sequential, and clojure.lang.Sequential is an interface with no behaviour of its own. So what extra could you do if you knew something was sequential? Is it something to do with Java interop?

[Alex Miller]

sequential? is useful for partitioning the collection space for conditional behavior.

In particular, sequential? covers vector, list, and sequence, all of which compare equal.