can-query-logic/doc/static-methods/set.union.md

query data

@function can-query-logic.set.union set.union
@parent can-query-logic.static

Perform a union of set types.

@signature `QueryLogic.set.union(setA, setB)`

  Performs a union of `setA` and `setB` and returns the
  result.  Will throw an error if [can-query-logic.defineComparison] has
  not been called with comparison operations
  necessary to perform the union.  Use [can-query-logic.prototype.union]
  to perform a union between two plain [can-query-logic/query] objects.

  `QueryLogic.set.union` can be used to test custom comparison types:

  ```js
  import {QueryLogic} from "can";

  const gt3 = new QueryLogic.GreaterThan(3);
  const lt6 = new QueryLogic.LessThan(6);

  const union = QueryLogic.union(gt3, lt6);
  console.log( union ); //-> QueryLogic.UNIVERSAL
  ```
  @codepen

  @param {SetType} [setA] An instance of a SetType.
  @param {SetType} [setB] An instance of a SetType.
  @return {SetType} An instance of a SetType.