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rOACCT/node_modules/lodash/unionWith.js
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unionWith.js
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			var baseFlatten = require('./_baseFlatten'),
			baseRest = require('./_baseRest'),
			baseUniq = require('./_baseUniq'),
			isArrayLikeObject = require('./isArrayLikeObject'),
			last = require('./last');

			/**
			* This method is like `_.union` except that it accepts `comparator` which
			* is invoked to compare elements of `arrays`. Result values are chosen from
			* the first array in which the value occurs. The comparator is invoked
			* with two arguments: (arrVal, othVal).
			*
			* @static
			* @memberOf _
			* @since 4.0.0
			* @category Array
			* @param {...Array} [arrays] The arrays to inspect.
			* @param {Function} [comparator] The comparator invoked per element.
			* @returns {Array} Returns the new array of combined values.
			* @example
			*
			* var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
			* var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
			*
			* _.unionWith(objects, others, _.isEqual);
			* // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
			*/
			var unionWith = baseRest(function(arrays) {
			var comparator = last(arrays);
			comparator = typeof comparator == 'function' ? comparator : undefined;
			return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
			});

			module.exports = unionWith;