vl.filter(filter)
Remove data that does not match provided conditions.
filter Method Overviewfilter API Reference# filter.filter(value)
The filter property must be a predication definition, which can take one of the following forms:
1) an expression string, where datum can be used to refer to the current data object. For example, {filter: "datum.b2 > 60"} would make the output data includes only items that have values in the field b2 over 60.
2) one of the field predicates: equal, lt, lte, gt, gte, range, oneOf, or valid,
3) a selection predicate, which define the names of a selection that the data point should belong to (or a logical composition of selections).
4) a logical composition of (1), (2), or (3).