strings4.rs (1170B)
1 fn string_slice(arg: &str) { 2 println!("{arg}"); 3 } 4 5 fn string(arg: String) { 6 println!("{arg}"); 7 } 8 9 fn 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 }