differenceBy.js
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differenceBy.js
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			var baseDifference = require('./_baseDifference'),
			baseFlatten = require('./_baseFlatten'),
			baseIteratee = require('./_baseIteratee'),
			baseRest = require('./_baseRest'),
			isArrayLikeObject = require('./isArrayLikeObject'),
			last = require('./last');

			/**
			* This method is like `_.difference` except that it accepts `iteratee` which
			* is invoked for each element of `array` and `values` to generate the criterion
			* by which they're compared. The order and references of result values are
			* determined by the first array. The iteratee is invoked with one argument:
			* (value).
			*
			* Note: Unlike `_.pullAllBy`, this method returns a new array.
			*
			* @static
			* @memberOf _
			* @since 4.0.0
			* @category Array
			* @param {Array} array The array to inspect.
			* @param {...Array} [values] The values to exclude.
			* @param {Function} [iteratee=_.identity] The iteratee invoked per element.
			* @returns {Array} Returns the new array of filtered values.
			* @example
			*
			* _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
			* // => [1.2]
			*
			* // The `_.property` iteratee shorthand.
			* _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
			* // => [{ 'x': 2 }]
			*/
			var differenceBy = baseRest(function(array, values) {
			var iteratee = last(values);
			if (isArrayLikeObject(iteratee)) {
			iteratee = undefined;
			}
			return isArrayLikeObject(array)
			? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), baseIteratee(iteratee, 2))
			: [];
			});

			module.exports = differenceBy;