Calculate Transform

The formula transform extends data objects with new fields (columns) according to an expression.

// Any View Specification
{
  ...
  "transform": [
    {"calculate": ..., "as" ...} // Calculate Transform
     ...
  ],
  ...
}

Property	Type	Description
calculate	String	*Required.* A expression string. Use the variable `datum` to refer to the current data object.
as	FieldName	*Required.* The field for storing the computed formula value.

Example

This example uses calculate to derive a new field, and then filters the data based on the new field.