Map
collections have a number
of useful properties and methods. Let's
take a look at them.
Collection size
The size
property contains
the size of the collection:
console.log(map.size);
Checking for a key presence
You can check if a key exists in a
collection using the has
method:
console.log(map.has(arr1));
Deletion by key
You can delete an element from a
collection using the delete
method:
map.delete(arr1);
Clearing a collection
You can clear an entire collection
using the clear
method:
map.clear();