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x/ramda/unionWith.js

:ram: Practical functional Javascript
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import _concat from './internal/_concat';import _curry3 from './internal/_curry3';import uniqWith from './uniqWith';

/** * Combines two lists into a set (i.e. no duplicates) composed of the elements * of each 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) -> [*] -> [*] -> [*] * @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 first and second lists concatenated, with * duplicates removed. * @see R.union * @example * * const l1 = [{a: 1}, {a: 2}]; * const l2 = [{a: 1}, {a: 4}]; * R.unionWith(R.eqBy(R.prop('a')), l1, l2); //=> [{a: 1}, {a: 2}, {a: 4}] */var unionWith = _curry3(function unionWith(pred, list1, list2) { return uniqWith(pred, _concat(list1, list2));});export default unionWith;