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

			/**
			* 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;
			}
			return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), baseIteratee(iteratee, 2));
			});

			module.exports = unionBy;