// Type casting in Rust is done via the usage of the `as` operator. // Note that the `as` operator is not only used when type casting. It also helps // with renaming imports. fn average(values: &[f64]) -> f64 { let total = values.iter().sum::<f64>(); total / values.len() as f64 // ^^^^^^ } fn main() { let values = [3.5, 0.3, 13.0, 11.7]; println!("{}", average(&values)); } #[cfg(test)] mod tests { use super::*; #[test] fn returns_proper_type_and_value() { assert_eq!(average(&[3.5, 0.3, 13.0, 11.7]), 7.125); } }