Set functions

Set functions perform various functions on values for multi-assign attributes, such as obtaining the size of the set, checking whether a set is empty, or converting an attribute from a multi-value to a single-value attribute.

This table describes the Set functions that Transform supports. The same functions are described in the Transform API Reference (Groovydoc).

User Function	Return Data Type	Description
`cardinality(Object attribute)`	`Long`	Inputs the set of values in a multi-assign attribute and obtains the size of that set. Works only on multi-value (multi-assign) attributes. Throws an exception if run on a single-assign attribute.
`isEmpty(Object attribute)`	`Boolean`	Inputs the set of values in a multi-assign attribute and checks whether this set is empty (has no assignments). Returns `true` if the set is empty. Works only on multi-value (multi-assign) attributes. Throws an exception if run on a single-assign attribute.
`isMemberOf(Object attribute, Object value)`	`Boolean`	Checks whether the value belongs to the set of values in a multi-assign attribute. Returns `true` if the value belongs to the set. Works only on multi-value (multi-assign) attributes. Throws an exception if run on a single-assign attribute.
`isNull(Object attribute)`	`Boolean`	Determines whether an attribute has any assigned values. Returns `true` if the attribute is null (has no assigned values). Works on both multi-assign and single-assign attributes.
`isSet(Object attribute)`	`Boolean`	Checks if an attribute is a multi-assign attribute. Returns `true` if yes. Works only on multi-value (multi-assign) attributes. Throws an exception if run on a single-assign attribute.
`toSet(Object... attributes)`	`Object[]`	Converts an Object argument list to an Object array. Works only on multi-value (multi-assign) attributes. Throws an exception if run on a single-assign attribute.
`toSingle(Object attribute)`	`Object`	Converts a multi-value attribute into a single-value attribute. Returns a single value chosen randomly from a set of values for the attribute. Works only on multi-value (multi-assign) attributes. Throws an exception if run on a single-assign attribute.