let s1 = String::from("hello world.");
let r1 = &s1;
let sl1 = &s1[..];
let sl2 = &r1[..];
let sl3 = r1[..];
println!("{}", sl3);
What is the difference between sl1
and sl2
, and why sl3
is invalid? Isn't r1
a reference already, why need &
?