By that argument, no one would ever learn anything. Everything in programming is new to someone at some point. There are useful features few people know about,

By that argument, no one would ever learn anything. Everything in programming is new to someone at some point. There are useful features few people know about, and you get them to be widespread and familiar by using and talking about them. Just because you only ever learned about `for` loops doesn’t mean you shouldn’t understand and use `map`.