set(X).cleared() - return emtpy copy of set list(X).cleared() - return emtpy copy of list string.cleared() - return emtpy string dict(K.cleared(V) adict) - return emtpy copy of dictionary
list(X).cleared() creates a new list with the same type as alist.
alist keeps unchanged. This function is useful for
polymorphic programming and allows to write code that
works for all collection types.
