I gave it a similar example that happened to be a function I needed to write recently (case-insensitive substring replacement, which is missing from the version

I gave it a similar example that happened to be a function I needed to write recently (case-insensitive substring replacement, which is missing from the version of .NET framework I was stuck with), and the solution it gave looked superficially correct too (and very similar to what I wrote), except it actually lower-cased everything, which I wouldn't consider correct. I just had to re-prompt "now without using ToLower", and it gave the correct solution though. I haven't tried co-pilot yet, but it would be curious to see how similar they are. I then asked it to give me a class to convert a Stream to a seekable Stream (something else I needed to do recently), and again, pretty impressed with the result (though I needed to avoid using MemoryStream so it could work with potentially huge streams, I tried to explain that but the solution didn't look right at all - basically the only way you can do it is by storing the data on disk).