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x/ramda/source/differenceWith.js

:ram: Practical functional Javascript
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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 = _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;