LINQ is so fucking useful and well designed feature of .NET ecosystem that it is unreal when you gotta use lang which doesnt have such a thing.
C# design team is/was unparalleled
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C# design team is/was unparalleled
It's pretty well put together but it was very hard to work out the patterns of what it was doing underneath e.g. I could not tell you now how to implement a custom IQueryable (I know where to look but couldn't tell you the rhythms of it) for some database and I am the type of person who usually does go and find that kind of thing out before using something for a "serious" project.
Maybe it's just a microcosm for C# as a whole - very productive language, good design team, quite hobbled by it's weird/philistine upbringings: Bjarne said within C++ there is a simple language trying to escape, in C# you basically have a simple language buried in nouns.
So what? I see LINQ used all the time, and it is almost entirely (extension) methods IEnumerable<T>
Could I implement IEnumerable<T>? I think I did once, as an exercise. It's not that complex. Not that interesting to be able to do it either.
LINQ is useful without EF. LINQ is not EF and EF is not LINQ.