4 ms·

Just the kind of information/expertise I was looking for, awesome!

• zebracanevra 2y ago
  And you can find that specilisation here: https://source.dot.net/#System.Linq/System/Linq/Last.cs,80 https://source.dot.net/#System.Linq/System/Linq/Last.cs,80
  • Capricorn2481 2y ago
    Why does the implementation of .Last not just check if .Count? It seems like there are things that don't implement IList but can still be indexed by the last entry?
    • neonsunset 2y ago
      In a strongly typed compiled language, how would you do so (in a type-safe and performant way) only knowing that the type is some IEnumerable<T> implementation and not a particular shape that may or may not adhere to the `T this[int i]` and `.Count //of T` contract?
      • Capricorn2481 2y ago
        Is using reflection for a quick property check that much of a performance hit? After all, avoiding it leads to footguns like this where someone didn't realize they were traversing an entire array. I'm not well versed on this topic.
• neonsunset 2y ago
  Thank you too!