apoc.coll.contains

Details
Syntax	`apoc.coll.contains(coll, value)`
Description	Returns whether or not the given value exists in the given collection.
Arguments	Name	Type	Description
	`coll`	`LIST<ANY>`	The list to search for the given value.
	`value`	`ANY`	The value in the list to check for the existence of.
Returns	`BOOLEAN`

Usage examples

The following checks if a collection contains a value using APOC and Cypher:

apoc.coll.contains

RETURN apoc.coll.contains([1,2,3,4,5], 4) AS output;

Cypher’s IN keyword

RETURN 4 IN [1,2,3,4,5] AS output;

Results
Output
true

The following checks if a collection contains all the values from another collection:

apoc.coll.contains

RETURN apoc.coll.contains([1,2,3,4,5], [3,7]) AS output;

Cypher’s IN keyword

RETURN [3,7] IN [1,2,3,4,5] AS output;

Results
Output
false

APOC will always return false when matching on a null value:

apoc.coll.contains

RETURN apoc.coll.contains([1, 2, null], null) AS output;

Results
Output
false

To check if a collection contains a null value, it is recommended to use Cypher’s any() function.

Cypher’s any()

RETURN any(x IN [1, 2, null] WHERE x IS NULL) AS output

Results
Output
true