String Formatting

Published: 2023-07-12
Updated: 2023-11-08

Source: https://doc.rust-lang.org/std/fmt/

Precision 🔗

Source: https://doc.rust-lang.org/std/fmt/#precision

let x = 0.01;
println!("Hello x is {x:.5}");

Prints: “Hello x is 0.01000”

Fill/Alignment 🔗

Source: https://doc.rust-lang.org/std/fmt/#fillalignment

let hours = 3;
println!("{hours:0>2}:25")

Prints: “03:25”

Pretty Printing 🔗

Source: https://doc.rust-lang.org/std/fmt/#sign0

‘#?’ - pretty-print the Debug formatting (adds line breaks and indentation)

format!("{:#?}", (100, 200));     // => "(
                                  //       100,
                                  //       200,
                                  //     )"