rustlings/solutions/09_strings/strings4.rs

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fn string_slice(arg: &str) {
println!("{arg}");
}
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fn string(arg: String) {
println!("{arg}");
}
fn main() {
string_slice("blue");
string("red".to_string());
string(String::from("hi"));
string("rust is fun!".to_owned());
// Here, both answers work.
// `.into()` converts a type into an expected type.
// If it is called where `String` is expected, it will convert `&str` to `String`.
string("nice weather".into());
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// But if it is called where `&str` is expected, then `&str` is kept `&str` since no conversion is needed.
// If you remove the `#[allow(…)]` line, then Clippy will tell you to remove `.into()` below since it is a useless conversion.
#[allow(clippy::useless_conversion)]
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string_slice("nice weather".into());
string(format!("Interpolation {}", "Station"));
// WARNING: This is byte indexing, not character indexing.
// Character indexing can be done using `s.chars().nth(INDEX)`.
string_slice(&String::from("abc")[0..1]);
string_slice(" hello there ".trim());
string("Happy Monday!".replace("Mon", "Tues"));
string("mY sHiFt KeY iS sTiCkY".to_lowercase());
}