Doc FAQ Cheatsheet

How do I convert X to Y?

Int to string

Use ToStr.

let x: int = 42;
let y: ~str = x.to_str();

String to int

Use FromStr, and its helper function, from_str.

let x: Option<int> = from_str("42");
let y: int = x.unwrap();

Int to string, in non-base-10

Use ToStrRadix.

use std::num::ToStrRadix;

let x: int = 42;
let y: ~str = x.to_str_radix(16);

String to int, in non-base-10

Use FromStrRadix, and its helper function, from_str_radix.

use std::num::from_str_radix;

let x: Option<int> = from_str_radix("deadbeef", 16);
let y: int = x.unwrap();

How do I get the length of a vector?

The Container trait provides the len method.

let u: ~[u32] = ~[0, 1, 2];
let v: &[u32] = &[0, 1, 2, 3];
let w: [u32, .. 3] = [0, 1, 2, 3, 4];

println!("u: {}, v: {}, w: {}", u.len(), v.len(), w.len()); // 3, 4, 5

Contributing to this page

For small examples, have full type annotations, as much as is reasonable, to keep it clear what, exactly, everything is doing. Try to link to the API docs, as well.

Similar documents for other programming languages:

• http://pleac.sourceforge.net/