Using
write!() with a format string that ends in a single newline 33 for col in row {
34 write!(f, " {} ", col)?;
35 }
36 write!(f, "\n")?; 37 }
38 Ok(())
39 }
Description
Several macros in the standard library such as print! and eprint! have
analogous macros such as println! and eprintln! that append a newline. Instead of
calling print! with an explicit newline character at the end of the format string,
prefer its alternative, println!.
Remove the trailing newline character from the original format string and replace the macro call with its analog:
print!withprintln!eprint!witheprintln!write!withwriteln!
Bad practice
print!("Hello, World!\n");
Recommended
println!("Hello, World!");