importbaseFlattenfrom'./_baseFlatten.js';importbaseIterateefrom'./_baseIteratee.js';importbaseRestfrom'./_baseRest.js';importbaseUniqfrom'./_baseUniq.js';importisArrayLikeObjectfrom'./isArrayLikeObject.js';importlastfrom'./last.js'; /** * This method is like `_.union` except that it accepts `iteratee` which is * invoked for each element of each `arrays` to generate the criterion by * which uniqueness is computed. Result values are chosen from the first * array in which the value occurs. The iteratee is invoked with one argument: * (value). * * @static * @memberOf _ * @since 4.0.0 * @category Array * @param {...Array} [arrays] The arrays to inspect. * @param {Function} [iteratee=_.identity] * The iteratee invoked per element. * @returns {Array} Returns the new array of combined values. * @example * * _.unionBy([2.1], [1.2, 2.3], Math.floor); * // => [2.1, 1.2] * * // The `_.property` iteratee shorthand. * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); * // => [{ 'x': 1 }, { 'x': 2 }] */var unionBy =baseRest(function(arrays){var iteratee =last(arrays);if(isArrayLikeObject(iteratee)){ iteratee =undefined;}returnbaseUniq(baseFlatten(arrays,1, isArrayLikeObject,true),baseIteratee(iteratee,2));}); exportdefault unionBy;