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Doc FAQ Cheatsheet
Chris Morgan edited this page Dec 11, 2013
·
18 revisions
Use ToStr
.
let x: int = 42;
let y: ~str = x.to_str();
Use FromStr
, and its helper function, from_str
.
let x: Option<int> = from_str("42");
let y: int = x.unwrap();
Use ToStrRadix
.
use std::num::ToStrRadix;
let x: int = 42;
let y: ~str = x.to_str_radix(16);
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();
Use the find_str
method.
let str = "Hello, this is some random string";
let index: Option<uint> = str.find_str("rand");
The Container
trait provides the len
method.
let u: ~[u32] = ~[0, 1, 2];
let v: &[u32] = &[0, 1, 2, 3];
let w: [u32, .. 5] = [0, 1, 2, 3, 4];
println!("u: {}, v: {}, w: {}", u.len(), v.len(), w.len()); // 3, 4, 5
Use the iter
method.
let values: ~[int] = ~[1, 2, 3, 4, 5];
for value in values.iter() { // value: &int
println(value.to_str());
}
(See also mut_iter
which yields &mut int
and move_iter
which yields int
while consuming the values
vector.)
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.
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