{
  "name": "$x_at",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Retrieves a x coordinate of the current feature's geometry.",
  "arguments": [{
    "arg": "i",
    "description": "index of point of a line (indices start at 0; negative values apply from the last index, starting at -1)"
  }],
  "examples": [{
    "expression": "$x_at(1)",
    "returns": "5"
  }],
  "tags": ["current", "retrieves", "feature", "coordinate"]
}