- For those clicking the link and feeling unsure how to play around, there's a panel on top left where you can choose Examples as source, select a name (there's

- For those clicking the link and feeling unsure how to play around, there's a panel on top left where you can choose Examples as source, select a name (there's only one at this time) and click load. Apologies for this silly advice (wasn't so obvious to me). - For those attempting to run the example at Rust home page[1], use `pub fn main` instead of `fn main` - You can also copy paste the following examples (switch on Colourise option avaiable in the top right panel) // a. will the compiler multiply? pub fn hours_to_milliseconds(h: int) -> int { h * 60 * 60 * 1000 } // b. optimizing index computations inside loop? pub fn calculate_brightness(r: &[int, ..256], g: &[int, ..256], b: &[int, ..256]) -> f64 { let mut sum = 0; for i in range(0u, 128) { sum += r[2*i] + r[2*i + 1]; sum += g[2*i] + g[2*i + 1]; sum += b[2*i] + b[2*i + 1]; } (sum as f64) / 3.0 } // c. macro expansion pub fn main() { println!("A {} has {} lives", "cat", 9); } [1] http://www.rust-lang.org/ http://www.rust-lang.org/