Removes all key/value pairs from the IMap object.
Returns true if an element in the map object existed and has been removed, or false if the element did not exist.
Calls callbackFn once for each key-value pair present in the map object. The ES6 Map class sends the value to the callback before the key, so this interface must do likewise.
OptionalthisArg: anyReturns a boolean asserting whether the key exists in the map object or not.
Returns a new iterator for iterating the keys of each pair.
Returns a new iterator for iterating the values of each pair.
An interface compatible with ES6 Map and BTree. This interface does not describe the complete interface of either class, but merely the common interface shared by both.