QGIS/resources/function_help/json/attribute

{
  "name": "attribute",
  "type": "function",
  "groups": ["Record and Attributes"],
  "description": "Returns an attribute from a feature.",
  "variants": [{
    "variant": "Variant 1",
    "variant_description": "Returns the value of an attribute from the current feature.",
    "arguments": [{
      "arg": "attribute_name",
      "description": "name of attribute to be returned"
    }],
    "examples": [{
      "expression": "attribute( 'name' )",
      "returns": "value stored in 'name' attribute for the current feature"
    }]
  }, {
    "variant": "Variant 2",
    "variant_description": "Allows the target feature and attribute name to be specified.",
    "arguments": [{
      "arg": "feature",
      "description": "a feature"
    }, {
      "arg": "attribute_name",
      "description": "name of attribute to be returned"
    }],
    "examples": [{
      "expression": "attribute( @atlas_feature, 'name' )",
      "returns": "value stored in 'name' attribute for the current atlas feature"
    }]
  }],
  "tags": ["attribute"]
}