QGIS/resources/function_help/json/IN

{
  "name": "IN",
  "type": "operator",
  "groups": ["Operators"],
  "description": "Returns TRUE if value is found within a list of values.",
  "arguments": [{
    "arg": "a",
    "description": "value"
  }, {
    "arg": "b",
    "description": "list of values"
  }],
  "examples": [{
    "expression": "'A' IN ('A','B')",
    "returns": "TRUE"
  }, {
    "expression": "'A' IN ('C','B')",
    "returns": "FALSE"
  }],
  "tags": ["list", "contained", "found"]
}