There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "In the bin folder, create a file called dynamic_json.rs."

A block of code is set as follows:

let s = "Hello".to_string();
println!("s: {}", s);
let s = String::from("Hello");
println!("s: {}", s);

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

let alphabet: Vec<_> = (b'A' .. b'z' + 1) // Start as u8
.map(|c| c as char)            // Convert all to chars
.filter(|c| c.is_alphabetic()) // Filter only alphabetic chars
.collect(); // Collect as Vec<char>

Any command-line input or output is written as follows:

name abraham
age 49
fav_colour red
hello world
(press 'Ctrl Z' on Windows or 'Ctrl D' on Unix)

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this.