this post was submitted on 08 Mar 2025
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Rust Programming

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Which is faster? (lemmings.world)
submitted 1 week ago* (last edited 1 week ago) by [email protected] to c/[email protected]
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let mut variable: Type;
loop {
    variable = value;
}

or

loop {
    let variable: Type = value;
}
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[–] [email protected] 1 points 5 days ago

This is too simplistic example to give any meaningful answer. What’s Type? What’s value? If it’s i32 and 42 than they both compile to the exact same thing. But if Type is Drop than the second will call the destructor on each iteration. (I’ve also written previously about similar example with BorrowedBuf^1^).