[Rust] String formatting

fn main() {
    // Hexadeicmal number
    assert_eq!(format!("0x{:X}", 255), "0xFF");

    // Octal number
    assert_eq!(format!("0o{:o}", 127), "0o177");

    // Decimal with specific precision
    assert_eq!(format!("{:.2}", 3.14159), "3.14");

    // Formatted string for debug purpose
    assert_eq!(format!("{:?}", vec![1, 2, 3]), "[1, 2, 3]");

    // Formatted string with specific position
    assert_eq!(format!("{0}, this is {1}. {1}, this is {0}", "Alice", "Bob"),
               "Alice, this is Bob. Bob, this is Alice");

    // Formatted string with specific name
    assert_eq!(format!("{subject} {verb} {object}", object = "the lazy dog",
                       verb = "jumps over", subject = "The swift fox"),
               "The swift fox jumps over the lazy dog");
}