QGIS/resources/function_help/json/map_get

{
  "name": "map_get",
  "type": "function",
  "groups": ["Maps"],
  "description": "Returns the value of a map, given its key. Returns NULL if the key does not exist.",
  "arguments": [ {"arg":"map","description":"a map"},
                 {"arg":"key","description":"the key to lookup"}],
  "examples": [ { "expression":"map_get(map('1','one','2','two'),'2')", "returns":"'two'"},
                { "expression":"map_get( item_variables('Map 0'), 'map_scale')", "returns":"scale of the item 'Map 0' (if it exists) in the current print layout"}
  ]
}