QGIS/resources/function_help/json/concat

{
  "function": "concat",
  "description": "Concatenates several strings to one.",
  "variableLenArguments": true,
  "arguments": [ {"arg":"string1", "syntaxOnly": true},
                 {"arg":"string2", "syntaxOnly": true},
                 {"arg":"string", "descOnly": true, "description":"a string value"}],
  "examples": [ { "expression":"concat('a','b','c','d','e')", "returns":"'abcde'"}]
}