It's standard in 1.9 That's why I said "(currently)". From the official Ruby homepage: The current stable version is 1.8.7. making it work in 1.8 is all of 3

It's standard in 1.9 That's why I said "(currently)". From the official Ruby homepage: The current stable version is 1.8.7. making it work in 1.8 is all of 3 lines I agree, but this still makes it not standard Ruby. The article should have mentioned this.