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digitalmars.D.learn - Applying a function each respective 2 elements of an array

reply kerdemdemir <kerdemdemir gmail.com> writes:
I have an array like(In my real problem my data structs is more 
complex ) :

auto a = [2,3,4,5,6,7];


I want to apply a operation in a fashion like :

      [ 2 , 3 ]  --> apply foo and get return result -1
          [ 3 , 4 ]  ---> -1
              [ 4 , 5 ] ---> -1
   and so on...

operation might be :

int foo ( int a, int b)
{
    return a - b;
}

So my expected result is [-1,-1,-1,-1,-1]

I tried fold but fold add up the result of the last operation.
Range utilities like "chunks" does not help because "chunks" 
transforms the array into a range like [2,3],[4,5],[6,7].

Can I avoid for loops and solve my problem with std algorithms or 
ranges ?
Mar 10 2019
parent reply Dennis <dkorpel gmail.com> writes:
On Sunday, 10 March 2019 at 08:59:59 UTC, kerdemdemir wrote:

 Can I avoid for loops and solve my problem with std algorithms 
 or ranges ?


Try slide: https://dlang.org/phobos/std_range.html#slide
And then use map.
Mar 10 2019
parent kerdemdemir <kerdemdemir gmail.com> writes:
On Sunday, 10 March 2019 at 09:43:59 UTC, Dennis wrote:

 On Sunday, 10 March 2019 at 08:59:59 UTC, kerdemdemir wrote:

 Can I avoid for loops and solve my problem with std algorithms 
 or ranges ?


 Try slide: https://dlang.org/phobos/std_range.html#slide
 And then use map.


I think that will work that is exactly what I am looking for 
thanks

Erdem
Mar 10 2019