QGIS/resources/function_help/json/is_directory

{
  "name": "is_directory",
  "type": "function",
  "groups": ["Files and Paths"],
  "description": "Returns TRUE if a path corresponds to a directory.",
  "arguments": [{
    "arg": "path",
    "description": "a file path or a map layer value. If a map layer value is specified then the file source of the layer will be used."
  }],
  "examples": [{
    "expression": "is_directory('/home/qgis/data/country_boundaries.shp')",
    "returns": "FALSE"
  }, {
    "expression": "is_directory('/home/qgis/data/')",
    "returns": "TRUE"
  }],
  "tags": ["path", "directory", "folder"]
}