Practice: Working with Map Objects
Instance properties
These properties are defined on Map.prototype
and shared by all Map
instances.
Map.prototype.constructor
-
The constructor function that created the instance object. For
Map
instances, the initial value is theMap
constructor. Map.prototype.size
-
Returns the number of key/value pairs in the
Map
object. Map.prototype[@@toStringTag]
-
The initial value of the
@@toStringTag
property is the string"Map"
. This property is used inObject.prototype.toString()
.