apoc.atomic.concat

Details
Syntax	`apoc.atomic.concat(container, propertyName, string [, retryAttempts ]) :: (container, property, oldValue, newValue)`
Description	Sets the given property to the concatenation of itself and the `STRING` value. The procedure then sets the property to the returned `STRING`.
Input arguments	Name	Type	Description
	`container`	`ANY`	The node or relationship that contains the property to which the value will be concatenated.
	`propertyName`	`STRING`	The name of the property to be concatenated.
	`string`	`STRING`	The string value to concatenate with the property.
	`retryAttempts`	`INTEGER`	The max retry attempts. The default is: `5`.
Return arguments	Name	Type	Description
	`container`	`ANY`	The updated node or relationship.
	`property`	`STRING`	The name of the updated property.
	`oldValue`	`ANY`	The original value on the property.
	`newValue`	`ANY`	The new value on the property.

Usage examples

The examples in this section are based on the following sample graph:

CREATE (:Person {name:'Tom',age: 40})
CREATE (:Person {name:'Will',age: 35})
CREATE (:Person {name:'David', children: ['Anne','Sam','Paul']})
CREATE (:Person {name:'John', cars: ['Class A','X3','Focus']})
CREATE (:Person {name:'Ryan', salary1:1800, salary2:1500});

The following concatenates iam to the name property for Will:

MATCH (p:Person {name:'Will',age: 35})
CALL apoc.atomic.concat(p,"name",'iam',5)
YIELD oldValue, newValue
RETURN oldValue, newValue;

Results
oldValue	newValue
"Will"	"William"

More documentation of apoc.atomic.concat