how to write a rust function that concatenates strings code example

Example 1: how to concatenate two &str in rust

// using 2 variables
let new_string = format!("{}{}", first_string, second_string);
// using 2 literals
let new_string = format!("{}{}", "first string ", "second string");

Example 2: rust concatenate strings

let text1 = "hello".to_owned();
let text2 = text1 + " world";
println!("{}", text2);