the number of elements in the Map.
Returns a specified element from the Map object. If the value that is associated to the provided key is an object, then you will get a reference to that object and any change made to that object will effectively modify it inside the Map.
Returns the element associated with the specified key. If no element is associated with the specified key, undefined is returned.
boolean indicating whether an element with the specified key exists or not.
Returns a specified element from the Map object. If the value that is associated to the provided key is an object, then you will get a reference to that object and any change made to that object will effectively modify it inside the Map.