Collections Library

YASL’s collections library defined the following functions.

Collections functions

Name	Arguments	Description
set	args…	Returns a set containing args.
list	args…	Alternate constructor for lists.
table	args…	Alternate constructor for tables.

Set functions

Name	Arguments	Description
tostr	self	Returns a string representation of self.
tolist	self	Creates a new list containing all the elements of self, in arbitrary order.
add	self, val	Updates self to contain val.
remove	self, val	Removes val from self.
copy	self	Creates a copy of self.
clear	self	Removes all elements from self.
contains	self, val	Returns true if val is in self, otherwise false.

Operator	Operands	Description
&	left, right	Set intersection of left and right.
|	left, right	Set union of left and right.
^	left, right	Symmetric set difference of left and right.
&^	left, right	Set difference of left and right.
len	set	Cardinality of set.
<	left, right	Checks left is a strict subset of right.
<=	left, right	Checks left is a subset of right.
>	left, right	Checks left is a strict superset of right.
>=	left, right	Checks left is a superset of right.
==	left, right	Checks left is equal to right.
!=	left, right	Checks left is not equal to right.