new set.Translate(clauseType, propertyName)

Localizes a clause's properties within another nested property.

var algebra = new set.Algebra(
  new set.Translate("where","$where")
);
algebra.has(
  {$where: {complete: true}},
  {id: 5, complete: true}
) //-> true

This is useful when filters (which are where clauses) are within a nested object.