writeln method

Writes the string representation of object followed by a newline.

Equivalent to buffer.write(object) followed by buffer.write("\n").

The newline is always represented as "\n", and does not use a platform specific line ending, e.g., "\r\n" on Windows.

Notice that calling buffer.writeln(null) will write the "null" string before the newline. Omitting the argument, or explicitly passing an empty string, is the recommended way to emit just the newline.