Confusing naming of function passed to Array.map

Hello,
not a real issue but just a naming of a method that confused me for a bit.
In [datasource/launch](https://github.com/apollographql/fullstack-tutorial/blob/master/final/server/src/datasources/launch.js#L10) there is method called `launchReducer` passed to `Array.map`. This method is responsible to take each launch returned by the Rest API and **mapping** it to another object.
So I guess this function should be called `lauchMapper`, because that's what it does. It doesn't reduce multiple element into a single one, isn't it?

Just highlighting this because it is a bit confusing

Apri final/server/src/datasources/launch.js alla definizione di launchReducer e verifica dove viene passato ad Array.map. Controlla ogni altro riferimento alla funzione, quindi aggiorna la denominazione in modo coerente affinché il nome della funzione rifletta il suo ruolo di mapping.

Scritto dal modello di indicizzazione a partire dal testo della issue.