Collection manipulation

MY-BASIC supplies a set of LIST, DICT manipulation function libraries which provide creation, accessing, iteration, etc. as below:

Name	Description
LIST	Creates a list
DICT	Creates a dictionary
PUSH	Pushes a value to the tail of a list
POP	Pops a value from the tail of a list
PEEK	Peeks the value of a tail of a list
INSERT	Inserts a value at a specific position of a list
SORT	Sorts a list increasingly
EXIST	Tells whether a list contains a specific value, or whether a dictionary contains a specific key
GET	Returns the value of a specific index in a list, or the value of a specific key in a dictionary
SET	Sets the value of a specific index in a list, or the value of a specific key in a dictionary
REMOVE	Removes the element of a specific index in a list, or the element of a specific key in a dictionary
CLEAR	Clears a list or a dictionary
CLONE	Clones a collection, each element will be duplicated
ITERATOR	Gets an iterator of a list or a dictionary
MOVE_NEXT	Moves an iterator to next position for a list or a dictionary

For example:

l = list(1, 2, 3, 4)
set(l, 1, “b”)
print exist(l, 2); pop(l); peek(l); len(l);

d = dict(1, “one”, 2, “two”)
set(d, 3, “three”)
print len(d)
it = iterator(d)
while move_next(it)
	print get(it);
wend