Thanks for share it, that is a very good addition. One question:
What do you mean by Map doesn't have prototype at all ?
I did a little test on my machine an got this
I believe he misspoke. His comparison was that, when using a plain Object as a map, you have to worry about the keys from the prototype chain. When using a Map, there are no keys already defined in the Map. A Map object is still and object and still uses the prototype chain to define itself.
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