### Re: Applying a function each respective 2 elements of an array

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

### Re: Applying a function each respective 2 elements of an array

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.

### Applying a function each respective 2 elements of an array

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 ?