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Interface: Set

rules.Set

interface   static

Set type.

A set is an unordered collection. A set cannot contain duplicate items.

There is no set literal for use in creating sets. Instead, create sets from lists using List.toSet(). See rules.List.

// Create a set and check its size
['a','b'].toSet().size() == 2

In addition to the methods listed below, sets have the following operators:

Operator Usage
x == y Compare sets x and y
v in x

Check if value v exists in set x. For example:

'a' in ['a','b'].toSet() == true

Methods

difference

difference() returns rules.Set

Returns a set that is the difference between the set calling difference() and the set passed to difference(). That is, returns a set containing the elements in the comparison set that are not in the specified set.

If the sets are identical, returns an empty set (size() == 0).

Returns

non-null rules.Set difference set containing the elements found in the comparison set that are not gound in the calling set.

Example 

['a','b'].toSet().difference(['a','c'].toSet()) == ['b'].toSet()

hasAll

hasAll() returns rules.Boolean

Test whether the set calling hasAll() contains all of the items in the comparison set passed to hasAll().

Returns

non-null rules.Boolean whether the calling set contains all the items of the comparison set or list.

Example 

['a','b'].toSet().hasAll(['a','c']) == false
['d','e','f'].toSet().hasAll(['d','e']) == true

hasAny

hasAny() returns rules.Boolean

Test whether the set calling hasAny() contains any of the items in the set or list passed to hasAny().

Returns

non-null rules.Boolean whether the calling set contains any of the items of the comparison set or list.

Example 

['a','b'].toSet().hasAny(['c','d'].toSet()) == false
['a','b'].toSet().hasAny(['a','c'].toSet()) == true

hasOnly

hasOnly() returns rules.Boolean

Test whether the set calling hasOnly() contains only the items in the comparison set or list passed to hasOnly().

Returns

non-null rules.Boolean whether the calling set contains only the items of the comparison set or list.

Example 

['a','b'].toSet().hasOnly(['a','c']) == false
['a','b'].toSet().hasOnly(['a','b']) == true

intersection

intersection() returns rules.Set

Returns a set that is the intersection between the set calling intersection() and the set passed to intersection(). That is, returns a set containing the elements the sets have in common.

If the sets have no elements in common, returns an empty set (size() == 0).

Returns

non-null rules.Set intersection set containing the elements found in both the calling set and the comparison set.

Example 

['a','b'].toSet().intersection(['a','c'].toSet()) == ['a'].toSet()

size

size() returns rules.Integer

Returns the size of the set.

Returns

non-null rules.Integer the number of values in the specified set.

union

union() returns rules.Set

Returns a set that is the union of the set calling union() and the set passed to union(). That is, returns a set that contains all elements from both sets.

Returns

non-null rules.Set union set containing all of the elements in both the calling set and comparison set.

Example 

['a','b'].toSet().union(['a','c'].toSet()) == ['a', 'b', 'c'].toSet()