Is calling puts without arguments bad practice?

Below is a small screenshot from within RubyMine 3.1. I am just starting to learn Ruby. The code here is from the Presenter-First MVP C# code generator over at atomicobject.com.

I am using this project along with a book to learn Ruby. The documentation for puts shows that it expects at least one parameter. Yet this code appears "somewhat legal" for two reasons:

1. The code appears to work fine when I step thru it via the debugger.
2. Searching online, and even here at SO, shows that puts w/o arguments creates a newline.

However,开发者_开发百科 is it bad practice to do this (hence the RubyMine warning)? The code I am looking at is from 2006. I'm running it with Ruby 1.9.2 if that matters any.

---

This is perfectly fine, as puts provides 'default' value for the first parameter:

def puts(obj='', *arg)

As for RubyMine, it doesn't show any errors for me. May it happen that you define method puts somewhere else in your code? You can cmd+click on it, to get to the definition.

Anyway, if you're able to reproduce problem in a clean new project, you can freely submit a bug report to JetBrains.

---

No, it can be helpful to create the physical line break in your source as well as the output, and like you have seen already, puts is perfectly capable of accepting zero arguments.

Personally, if I'm creating a multi-line output I prefer to use here-doc syntax.