statement:
var map = new Map()
method:
clear
Removes all elements from the map.
delete
Removes the specified element from the map.
forEach
perform the specified operation on the map each element.
get
Returns the specified element map.
has
if the map contains the specified elements, it returns true.
set
to add a new element to the map.
toString
Returns a string representation of the map.
valueOf
Returns the object's original value.