C# 15: Extension indexers

Extension indexers on one page: add square brackets to a class you can't change, and count from the end with ^1. From the blog post [What's new in C# 15: Extension indexers](/blog/whats-new-in-csharp-15-extension-indexers).

Updated

The cheat sheet C# 15: Extension indexers, with Codey: the three points of the post on one page
Category
C#
Level
Apprentice
Tags
csharp, csharp-15, whats-new