Transforms¶
Transforms allow for modifying the data before it is displayed on screen. They may filter or derive data, adding or removing fields or rows.
TODO: More about the data flow etc...
Example¶
The following example uses the filter
transform to retain
only the rows that match the predicate expression.
{ ..., "data": { ... }, "transform": [ { "type": "filter", "expr": "datum.end - datum.start < 5000" } ], ... }