It's hard to explain 20 years ago, but today if someone has used enough something like Reactive extension, Promise, LinQ, async/await, Optional, etc. There's a

It's hard to explain 20 years ago, but today if someone has used enough something like Reactive extension, Promise, LinQ, async/await, Optional, etc. There's a great chance to make one wonder about the similar pattern behind this, and then he can understand the abstraction very easily.