References

summary
public	F * constant(keys: Iterable, value: any): IterableIterator Creates a mapping from a sequences of keys and a single value.
public	F fromMap(map: Map): IterableIterator Instantiate a mapping from a map.
public	F fromObject(object: Object): IterableIterator Instantiate a mapping from an object.
public	F * inverse(mapping: Iterable): IterableIterator Inverse a mapping.
public	F toMap(mapping: Iterable): Map Instantiate a map from a mapping.
public	F toObject(mapping: Iterable): Object Instantiate an object from a mapping.