Writing all this code is fun, but when you have to actually deploy, it can be nerve-wracking. A bad deployment can result in corrupted data, system failures, angry customers and hours of wasted time. Avoiding busted deployments will become a priority after you experience one.
There are two basic types of feature flags: release toggles and business toggles. Release toggles are used for rolling out new features in continuous deployment. Business toggles allow for restricted user access such as through premium accounts. The simplest feature flags are boolean statements however they can be more.