【Rust】迭代器(五)
阿新 • • 發佈:2022-05-28
環境
- Time 2022-03-23
- Rust 1.59.0
示例
find_map
fn main() {
let vec = ["lol", "NaN", "2", "5"];
let result: Option<i32> = vec.iter().find_map(|s| s.parse().ok());
println!("{result:?}");
}
position
fn main() { let vec = vec![0, 1, 2, 3, 4]; let result = vec.iter().position(|e| e > &2); println!("{result:?}"); }
rposition
fn main() {
let vec = vec![0, 1, 2, 3, 4];
let result = vec.iter().rposition(|e| e > &2);
println!("{result:?}");
}
max
fn main() {
let vec = vec![0, 1, 2, 3, 4];
let result = vec.iter().max();
println!("{result:?}");
}
min
fn main() { let vec = vec![0, 1, 2, 3, 4]; let result = vec.iter().min(); println!("{result:?}"); }
rev
fn main() {
let vec = vec![0, 1, 2, 3, 4];
vec.iter().rev().for_each(|e| println!("{e:?}"));
}
sum
fn main() {
let vec = vec![0, 1, 2, 3, 4];
let result: i32 = vec.iter().sum();
println!("{result:?}");
}
product
fn main() { let vec = vec![0, 1, 2, 3, 4]; let result: i32 = vec.iter().product(); println!("{result:?}"); }
總結
瞭解了迭代器中相關的一些方法。