apoc.map.merge
Function

Details
Syntax	`apoc.map.merge(map1, map2)`
Description	Merges the two given `MAP` values into one `MAP`.
Arguments	Name	Type	Description
	`map1`	`MAP`	The first map to merge with the second map.
	`map2`	`MAP`	The second map to merge with the first map.
Returns	`MAP`

Usage examples

The following merges two maps:

apoc.map.merge

WITH {name: "Cristiano Ronaldo", dob: date("1985-02-05")} AS map1, {country: "Portugal"} AS map2
RETURN apoc.map.merge(map1, map2) AS output;

Cypher’s Map Comprehension

WITH {name: "Cristiano Ronaldo", dob: date("1985-02-05")} AS map1, {country: "Portugal"} AS map2
RETURN { k IN keys(map1) + keys(map2) | k: coalesce(map2[k], map1[k]) } AS output;

Results
Output
{ "name": "Cristiano Ronaldo", "country": "Portugal", "dob": "1985-02-05" }