The example of match usage is really poor. From the looks of it there is no "pattern matching" going on at all here. I don't know the syntax, but even something like this would be a better demonstration: let computed_key = match (key.len() > self.block_size, key.len() self.zero_pad(self.hash(key).digest), (false, true) => self.zero_pad(key), (false, false) => key } At least there is some matching here, unlike in the…
You're right that it's not an ideal example. I think I said that in the post. The context of the article was the week I spent with Rust and the project I actually did with it. There was not a better example in my code to show. I could have contrived something, but it wasn't really in spirit of what I was writing about.
You probably should fix this in your code too. As noted in this thread, that's not a proper way to use pattern matching. Anyone reading your code will be confused by this usage and that's not a good thing. It probably would be best to use this:
match key.cmp(self.block_size) {
Equal => ..
Greater => ..
Less => ...
}