Printing to stdout

I was sadly mistakened about p being an alias for print while trying to use the output_to_stdout matcher for a spec.

class RubyClass end;

describe RubyClass do
  it 'keeps a reference to self' do
    block = lambda {
      class RubyClass
        p self
      end
    }

    expect { block.call }.to output('RubyClass').to_stdout
  end
end

Using p and running the spec results in "RubyClass\n". I know p uses inspect instead of to_s, which is super helpful when working with assorted data structures in console. I just never noticed p always adding a newline.

In contrast, print uses to_s and does not add a newline, so really completely different behavior from p.

In short, print is puts without the newline. They both return nil since they call to_s. p adds a newline, but calls inspect instead.