Weird Ruby: Positive and Negative Strings

And here we are:

Turns out that when frozen string literals were introduced in Ruby 2.3 a couple of unary methods were added to the class – namely unary and . Here’s its description from the official API docs:

And here are a few examples:

Generally, I don’t think you’ll find any use for it if you’re leveraging the pragma, but it’s an useful shorthand to freeze a string otherwise. A word of caution – the positive and negative string literals result in code that’s pretty weird, so you should use them sparingly.

Source: metaredux.com