Formula

The "formula" transform uses an expression to calculate and add a new field to the data objects.

Parameters

as Required

The (new) field where the computed value is written to

expr Required

An expression string

Example

Given the following data:

x	y
1	2
3	4

... and configuration:

{
  "type": "formula",
  "expr": "datum.x + datum.y",
  "as": "z"
}

A new field is added:

x	y	z
1	2	3
3	4	7