The Map is the new object type that allows storing collections of key-value pairs. The map is similar to the Object but the main difference is that Map allows keys of any type, even objects or functions. It is easy to get the size of a Map, while it needs more effort to get the size of objects.
Take a look at a simple example on the Map with available methods and properties i.e.
set, get, has, delete, clear and
and undefined and null, which are … slightly odd. And Array, which is a special kind of object. Date and RegExp, which are objects that you get for free. And to be technically accurate, functions are just a special type of object. So the type of diagram looks like this:
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