Flat Map in JavaScript Language

Flat map is a method on arrays, kind of like map with the added functionality that if you've got an array of arrays, it flattens it into an array. If you return a promise inside of flat map and then of a promise, you know, you don't get a promise of a promises, right? It's automatically flattened. And promises work the same way. So those are the same method. Let me quickly pull up the MDN. Flat map in MDN  is literally called flat map in JavaScript language.