QGIS/resources/function_help/json/array_count

{
  "name": "array_count",
  "type": "function",
  "groups": ["Arrays"],
  "description": "Counts the number of occurrences of a given value in an array.",
  "arguments": [{
    "arg": "array",
    "description": "an array"
  }, {
    "arg": "value",
    "description": "the value to count"
  }],
  "examples": [{
    "expression": "array_count(array('a', 'b', 'c', 'b'), 'b')",
    "returns": "2"
  }],
  "tags": ["number", "array", "occurrences", "given", "counts"]
}