t_wの輪郭

let v1 = vec![1, 2, 3];
let v2:Vec<u32> = v1.iter().map(|x|{x + 1}).collect();
assert_eq!(v1, vec![1, 2, 3]);
assert_eq!(v2, vec![2, 3, 4]);

let v1:Vec<String> = vec![String::from("Hoge"), String::from("Fuga"), String::from("Foo")];
let v2:Vec<String> = v1.iter().map(|x|{format!("{}{}", x, x)}).collect();
assert_eq!(v1, vec![String::from("Hoge"), String::from("Fuga"), String::from("Foo")]);
assert_eq!(v2, vec![String::from("HogeHoge"), String::from("FugaFuga"), String::from("FooFoo")]);