QGIS/resources/function_help/json/array_prepend

{
  "name": "array_prepend",
  "type": "function",
  "description": "Returns an array with the given value added at the beginning.",
  "arguments": [ {"arg":"array","description":"an array"},
                 {"arg":"value","description":"the value to add"}],
  "examples": [ { "expression":"array_prepend(array(1,2,3),0)", "returns":"array: 0,1,2,3"}]
}