When O3 is 2x slower than O2

Re:When O3 is 2x slower than O2 by bernds74 on Sunday November 02, 2025 @10:10AM (#45790851)

"if let" just breaks my brain, it feels backwards to me and takes me a minute each time to work out what's going on. In 40 years of programming I've never seen a syntactic construct that I found less intuitive. And it would probably be easily fixable, if it was more along the lines of "if x matches Some(let z)".

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Re:When O3 is 2x slower than O2 by ai_ on Sunday November 02, 2025 @04:43PM (#45793702)

if let makes a lot more sense when you learn that a normal let expression also takes a pattern[1].

  let Coordinates(x, y) = get_coords();

But this is intended for "exhaustive patterns". If you can't express an exhaustive pattern, like with an Option, then you can use let ... else

  let Some((x, y)) = get_coords() else { return };

if let is just an extension of this "let pattern" system.

Once you internalize how patterns work (and they really work everywhere) it all starts to really make sense and feels a lot cleaner.

[1]: https://doc.rust-lang.org/reference/patterns.html

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