filter method

VlChart filter(
  1. String expression
)

Keeps only the rows an expression accepts.

expression A Vega expression over the row's columns.

Returns This chart, so calls chain.

Implementation

VlChart filter(String expression) {
  VlJson t = VlJson.objectValue();
  t.setMember("filter", VlJson.stringValue(expression));
  this.transforms.arr.add(t);
  return this;
}