QGIS/resources/function_help/json/$currentfeature

{
  "name": "$currentfeature",
  "type": "function",
  "groups": ["Record and Attributes"],
  "description": "Returns the current feature being evaluated. This can be used with the 'attribute' function to evaluate attribute values from the current feature. <b>WARNING: This function is deprecated. It is recommended to use the replacement @feature variable instead.</b>",
  "examples": [{
    "expression": "attribute( $currentfeature, 'name' )",
    "returns": "value stored in 'name' attribute for the current feature"
  }],
  "tags": ["evaluated", "attribute", "current", "evaluate"]
}