Rust

2.4    Code Blocks

A code block is a section of code enclosed in curly braces {}. You use code blocks in many contexts, including functions, loops, conditionals, and more. They group together multiple statements and expressions, and in Rust, the last expression in a code block is automatically returned as the value of that block.

We mentioned code blocks earlier in Section 2.1.3 when discussing the scope of a variable. Now, consider the code shown in Listing 2.9.

fn main() {    let full_name = {        let first_name = "John";        let last_name = "Archer";        format!("{first_name} {last_name}")    };}  

Listing 2.9     An Example of a Code Block

The format! macro is used for String formatting. The placeholders inside the double quotes will be filled with the respective ...