There is a new edition of the book and this is an old link.
A type cast expression is denoted with the binary operator
as
. Executing anas
expression casts the value on the left-hand side to the type on the right-hand side.
fn average(values: &[f64]) -> f64 { let sum: f64 = sum(values); let size: f64 = len(values) as f64; sum / size }Run
Here are the relevant sections in the new and old books: