Question

I need to get an array containing reversed alternate elements of the original array.

For example: an array containing elements {12,56,67}.

I need to get an array containing {67,12}
(reversing array to get {67,56,12} then take alternate elements means {67,12})

I need to do this in c#

Answer 1

If you’re using C# 3, try this:

int[] array = {1,2,3,4,5,6};
var x = array.Reverse().Where( (n,i) => i % 2 !=0);

Where is an extension method (new in C# 3.0) which forms part of a language feature called LINQ. It filters a sequence based on a predicate. In the sample above, n is the element of the sequence and i is the zero based index of the element in the sequence. Both are strongly typed. The predicate i%2!=0 is saying that the index of the element is not directly divisible by 2, so what we are saying is reverse the list and select the odd elements from it.

Not the most efficient solution, but short and concise.