rustFormat string at compile time in Rust

Format strings in Rust can be compiled at compile time using the format! macro. This macro takes a format string as its first argument, followed by any number of arguments that will be used to fill in the format string. The format string can contain placeholders for the arguments, which are denoted by curly braces {}.

Code example:

let name = "John";
let age = 30;
let message = format!("Hello, my name is {}, and I am {} years old.", name, age);
println!("{}", message);

Output

Hello, my name is John, and I am 30 years old.

Explanation of code parts:

1. let name = "John"; - This line declares a variable name and assigns it the value of the string John.
2. let age = 30; - This line declares a variable age and assigns it the value of the integer 30.
3. let message = format!("Hello, my name is {}, and I am {} years old.", name, age); - This line uses the format! macro to create a string with the given format string and arguments. The placeholders {} are replaced with the values of the variables name and age.
4. println!("{}", message); - This line prints the value of the message variable to the console.

Helpful links:

1. https://doc.rust-lang.org/std/macro.format.html
2. https://doc.rust-lang.org/rust-by-example/macros/format.html

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