Map
delete
- delete(map, key)
- map must be primitive map, jsonObject or object map
- key must be primitive string
let m = {first: 10, second: 20}
delete(m, "first") // m is now the map {second: 20}
let m = {first: 10, second: 20}
delete(m, "first") // m is now the map {second: 20}