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

Ouvrez final/server/src/datasources/launch.js à la définition de launchReducer et vérifiez où elle est passée à Array.map. Vérifiez toute autre référence à la fonction, puis mettez à jour le nommage de manière cohérente afin que le nom de la fonction reflète son rôle de mapping.

Rédigé par le modèle d'indexation à partir du texte de l'issue.