JavaScript performance between object.property and map.get(object)

In ECMAScript 6, I have two way to define a dictionary:

Traditional method (with dictionary = Object.create(null)):

  • set property: dictionary.key = value or dictionary[key] = value

  • get property: dictionary.key or dictionary[key]

Using Map (with dictionary = new Map()):

  • set a reference: dictionary.set(key, value)

  • get a reference: dictionary.get(key)

In V8, are they give the same performance?

Answer:1

You can test it yourself with JSPerf at here and here. It looks like the result is quite vary depending on V8 version.

Answer:2

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