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;