.Net Tips – Use LINQ to create pairs of adjacent elements from a collection

Suppose you have an array of numbers, say, [1, 3, 5, 7, 9, …], and you want to pair each element up with its neighbour in the array, e.g. [[1, 3], [3, 5], [5, 7], [7, 9], …].

Sure, you can iterate through the indices of the elements and recursively grab the element at an index and its neighbour:

   1: // an array of odd numbers

   2: var arr = new[] { 1, 3, 5, 7, 9, 11, 13, 15, 17, 19 };

   3:

   4: // standard imperative way, iterate through the indices and grab

   5: // the elements from the arrays

   6: var arrPairs = new List<int[]>();

   7: for (var i = 0; i < arr.Length - 1; i++)

   8: {

   9:     arrPairs.Add(new[] { arr[i], arr[i+1] });

  10: }

OR, you can use LINQ and the Zip method added in .Net 4 and do this instead:

   1: var arrPairsLinq = arr.Skip(1).Zip(arr, (second, first) => new[] { first, second }).ToArray();

A much more elegant solution, no? ;-)

Liked this article? Support me on Patreon and get direct help from me via a private Slack channel or 1-2-1 mentoring.
Subscribe to my newsletter


Hi, I’m Yan. I’m an AWS Serverless Hero and the author of Production-Ready Serverless.

I specialise in rapidly transitioning teams to serverless and building production-ready services on AWS.

Are you struggling with serverless or need guidance on best practices? Do you want someone to review your architecture and help you avoid costly mistakes down the line? Whatever the case, I’m here to help.

Hire me.


Check out my new course, Complete Guide to AWS Step Functions. In this course, we’ll cover everything you need to know to use AWS Step Functions service effectively. Including basic concepts, HTTP and event triggers, activities, callbacks, nested workflows, design patterns and best practices.

Get Your Copy