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wongyouth/gist:f8cd289e7d763ac11494dff2b80d9113

Created August 14, 2017 01:20
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JS Map vs JS Object
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gistfile1.txt
1. Map 没有来自 Object.prototype 的属性，比如： __proto__, toString
2. Map 中的key可以是任何类型，Object 只能是 String
3. Map 对象迭代时的顺序与加入时的顺序一致。
ref: https://ponyfoo.com/articles/es6-maps-in-depth
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