elem package:foldl

(elem a) returns True if the container has an element equal to a, False otherwise

(elem w8) returns True if the byte stream has a byte equal to w8, False otherwise

(elem c) returns True if the text stream has a character equal to c, False otherwise

(elemIndex a) returns the index of the first element that equals a, or Nothing if no element matches

(elemIndex w8) returns the index of the first byte that equals w8, or Nothing if no byte matches

(elemIndex c) returns the index of the first character that equals c, or Nothing if no character matches

(notElem a) returns False if the container has an element equal to a, True otherwise

(notElem w8) returns False if the byte stream has a byte equal to w8, True otherwise

(notElem c) returns False if the text stream has a character equal to c, True otherwise