Great :) thanks :)
On Friday, July 17, 2015 at 2:14:50 AM UTC+2, Jonathan Winandy wrote:
>
> Hello !
>
> I think, this branch (without :<< empty?))
>
> (match [l prefix]
> * [_ ([] :seq)] true*
>
> is already checking that prefix is empty.
>
> Have a nice day,
> Jon
>
>
> On 16 July 2015 at 23:06, Rastko Soskic <rss...@gmail.com <javascript:>>
> wrote:
>
>> Hi, I am getting familiar with Clojure's core.match and
>> simply starting with something simple and familar (some Scala match
>> expressions)
>> and translating that to core.match variant:
>> Check out this function which checks whether sequence starts with another:
>>
>> def startsWith[A](l: List[A], prefix: List[A]): Boolean = (l,prefix)
>> match {
>> case (_,Nil) => true
>> case (Cons(h,t),Cons(h2,t2)) if h == h2 => startsWith(t, t2)
>> case _ => false
>> }
>>
>> and my core.match attempt which works but I am not really sure
>> about it as wiki page is not yet exhaustive enough:
>>
>> (defn starts-with [l prefix]
>> (match [l prefix]
>> * [_ ([] :seq :<< empty?)] true*
>> [([h & t] :seq) ([h2 & t2] :seq)] (if (= h h2)
>> (starts-with t t2)
>> false)
>> :else false))
>>
>> second and third one are nothing special, former is just match
>> continuation.
>> First one is of particular interest for me...
>> Matching to Nil sequence in clojure is not appropriate as empty sequence
>> simply is not nil
>> whereas it is handled differently in scala.
>>
>> What I wanted here is to check with empty? function if second argument
>> (prefix)
>> is empty sequence... Like I said...it works but I am not sure if there is
>> better
>> way to achieve function application to :seq pattern. I don't need to
>> destructure or bind
>> that to any particular var just to check if it is empty.
>>
>> Any tip, suggestion or critic is welcome and appreciated.
>>
>> Thanks in advance.
>>
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