Zhenghao's site

When You Should Prefer Map Over Object In JavaScript#javascript See discussions on reddit In JavaScript, objects are handy. They allow us to easily group multiple pieces of data together. After ES6, we got a new addition to the language - Map. In a lot of aspects, it seems like a more capable Object with a somewhat clumsy interface. However, most people still reach for objects when they need a has

[efcl]

MapとObjectの使い分けについての記事。 Objectを使うときとObjectの問題、Mapの使い方とMapのベンチマーク。

[jay-es]

Object はコンフィグのようにプロパティが固定のレコード向き。Map はキーの数が可変で頻繁に更新される辞書やハッシュマップ向き。ほとんどの場合、Map の方が追加・削除・反復速度もメモリ消費も優れている