The dict pattern: objects without prototypes are better maps

Using objects as maps from strings to values has several pitfalls. This blog post describes a pattern that eliminates some of them. The pitfalls If you are (ab)using objects as maps from strings to values, you’ll encounter several pitfalls: Inherited properties prevent you from directly using the in operator for checking for a key and brackets for reading a value: > var empty = {}; // empty map >

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{} オブジェクトはObjectからのtoString等を持っているので、Object.create(null)を使い、よりキレイなオブジェクトを使う話について