ReactでObject.keysとmapを使ってobject of objectsを展開する #React - Qiita
GitHub - sindresorhus/map-obj: Map object keys and values into a new object
How to get the first key name of a JavaScript object ? - GeeksforGeeks
Maps A map is an object that maps keys to values Each key can map to at most one value, and a map cannot contain duplicate keys KeyValue Map Examples Dictionaries: -
Map Vs Object. In JavaScript, both maps and objects… | by Gurinderpal Singh Narang | Medium