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1fn string_slice(arg: &str) {
2 println!("{arg}");
3}
4
5fn string(arg: String) {
6 println!("{arg}");
7}
8
9fn main() {
10 string_slice("blue");
11
12 string("red".to_string());
13
14 string(String::from("hi"));
15
16 string("rust is fun!".to_owned());
17
18 // Here, both answers work.
19 // `.into()` converts a type into an expected type.
20 // If it is called where `String` is expected, it will convert `&str` to `String`.
21 string("nice weather".into());
22 // But if it is called where `&str` is expected, then `&str` is kept `&str` since no conversion is needed.
23 // If you remove the `#[allow(…)]` line, then Clippy will tell you to remove `.into()` below since it is a useless conversion.
24 #[allow(clippy::useless_conversion)]
25 string_slice("nice weather".into());
26
27 string(format!("Interpolation {}", "Station"));
28
29 // WARNING: This is byte indexing, not character indexing.
30 // Character indexing can be done using `s.chars().nth(INDEX)`.
31 string_slice(&String::from("abc")[0..1]);
32
33 string_slice(" hello there ".trim());
34
35 string("Happy Monday!".replace("Mon", "Tues"));
36
37 string("mY sHiFt KeY iS sTiCkY".to_lowercase());
38}