ramda/es/differenceWith.js

import _includesWith from "./internal/_includesWith.js";
import _curry3 from "./internal/_curry3.js";
/**
 * Finds the set (i.e. no duplicates) of all elements in the first list not
 * contained in the second list. Duplication is determined according to the
 * value returned by applying the supplied predicate to two list elements.
 *
 * @func
 * @memberOf R
 * @since v0.1.0
 * @category Relation
 * @sig ((a, a) -> Boolean) -> [a] -> [a] -> [a]
 * @param {Function} pred A predicate used to test whether two items are equal.
 * @param {Array} list1 The first list.
 * @param {Array} list2 The second list.
 * @return {Array} The elements in `list1` that are not in `list2`.
 * @see R.difference, R.symmetricDifference, R.symmetricDifferenceWith
 * @example
 *
 *      const cmp = (x, y) => x.a === y.a;
 *      const l1 = [{a: 1}, {a: 2}, {a: 3}];
 *      const l2 = [{a: 3}, {a: 4}];
 *      R.differenceWith(cmp, l1, l2); //=> [{a: 1}, {a: 2}]
 */

var differenceWith =
/*#__PURE__*/
_curry3(function differenceWith(pred, first, second) {
  var out = [];
  var idx = 0;
  var firstLen = first.length;

  while (idx < firstLen) {
    if (!_includesWith(pred, first[idx], second) && !_includesWith(pred, first[idx], out)) {
      out.push(first[idx]);
    }

    idx += 1;
  }

  return out;
});

export default differenceWith;