Function difference

external/.d3.js:1301–1309

(values, ...others)

}

function difference(values, ...others) {
  values = new InternSet(values);
  for (const other of others) {
    for (const value of other) {
      values.delete(value);
    }
  }
  return values;
}

function disjoint(values, other) {
  const iterator = other[Symbol.iterator](), set = new InternSet();