There are tricks/an art to Rust's iterator semantics. One example I know of is that when trying to calculate a dot product, you can improve the generated code

There are tricks/an art to Rust's iterator semantics. One example I know of is that when trying to calculate a dot product, you can improve the generated code and elide the bounds check only by a very particular syntax: // Must slice to equal lengths, and then bounds checks are eliminated! let len = cmp::min(xs.len(), ys.len()); let mut xs = &xs[..len]; let mut ys = &ys[..len]; let mut s = 0.; for i in 0..xs.len() { s += xs[i] * ys[i]; } https://users.rust-lang.org/t/how-to-zip-two-slices-efficiently/2048/10 https://users.rust-lang.org/t/how-to-zip-two-slices-efficien... https://github.com/rustsim/nalgebra/blob/b1b18d17ee64d3fd28b67ac581d28af4d20ec817/src/base/blas.rs#L334-L342 https://github.com/rustsim/nalgebra/blob/b1b18d17ee64d3fd28b...