Concatenation in Rust 1.55

In Rust, you can concatenate strings using the + operator. Here's an example:

fn main() {
    let word1 = "Hello";
    let word2 = "World";
let hello_world = word1.to_string() + " " + word2;
println!("{}", hello_world);

}

In this example, we declare two variables word1 and word2, both of which are string literals. We then concatenate them using the + operator, and store the result in a new variable called hello_world. Finally, we print out the contents of hello_world.

Alternatively, you can use the format!() macro to concatenate strings like this:

fn main() {
    let word1 = "Hello";
    let word2 = "World";
let hello_world = format!("{} {}", word1, word2);
println!("{}", hello_world);

}

In this example, we use the format!() macro to concatenate the strings. Inside the format!() macro, we specify the format string, followed by the variables we want to include in the string, separated by commas. The resulting string is stored in the hello_world variable, which we then print out.