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"
  }],
  "tags": ["map", "exists", "key"]
}