queryLogic.difference(a, b)

Returns a set that represents the difference of sets A and B. In set theory, a difference is represented by A \ B. The returned query would represent the values that are in one set that are not in the another set. Difference is sometimes known as relative complement in set theory.

import {QueryLogic} from "can";

const queryLogic = new QueryLogic();

const filter = queryLogic.difference(
  { filter: { name: {$in: ["Ramiya", "Bohdi"]} } },
  { filter: { name: "Bohdi" } }
);
console.log( filter ); //-> {filter: {name: "Ramiya"}}

// A is totally inside B
const emptyFilter = queryLogic.difference(
  { filter: { name: "Bohdi" } },
  {}
);
console.log( emptyFilter ); //-> QueryLogic.EMPTY