flatMapDeep.js
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flatMapDeep.js
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			var baseFlatten = require('./_baseFlatten'),
			map = require('./map');

			/** Used as references for various `Number` constants. */
			var INFINITY = 1 / 0;

			/**
			* This method is like `_.flatMap` except that it recursively flattens the
			* mapped results.
			*
			* @static
			* @memberOf _
			* @since 4.7.0
			* @category Collection
			* @param {Array\|Object} collection The collection to iterate over.
			* @param {Function} [iteratee=_.identity] The function invoked per iteration.
			* @returns {Array} Returns the new flattened array.
			* @example
			*
			* function duplicate(n) {
			* return [[[n, n]]];
			* }
			*
			* _.flatMapDeep([1, 2], duplicate);
			* // => [1, 1, 2, 2]
			*/
			function flatMapDeep(collection, iteratee) {
			return baseFlatten(map(collection, iteratee), INFINITY);
			}

			module.exports = flatMapDeep;