@thi.ng/associative/union.js

ES Map/Set-compatible implementations with customizable equality semantics & supporting operations

import { copy } from "@thi.ng/object-utils/copy";
import { __combineSet } from "./internal/combine.js";
import { into } from "./into.js";
const union = (a, b, out) => {
  if (a.size < b.size) {
    const t = a;
    a = b;
    b = t;
  }
  out = out ? into(out, a) : copy(a, Set);
  return a === b ? out : into(out, b);
};
function unionR(src) {
  return __combineSet(unionR, union, src);
}
export {
  union,
  unionR
};