HORIZON PROJECT

var baseFlatten = require('./_baseFlatten'),

    toInteger = require('./toInteger');

/**

 * Recursively flatten `array` up to `depth` times.

 *

 * @static

 * @memberOf _

 * @since 4.4.0

 * @category Array

 * @param {Array} array The array to flatten.

 * @param {number} [depth=1] The maximum recursion depth.

 * @returns {Array} Returns the new flattened array.

 * @example

 *

 * var array = [1, [2, [3, [4]], 5]];

 *

 * _.flattenDepth(array, 1);

 * // => [1, 2, [3, [4]], 5]

 *

 * _.flattenDepth(array, 2);

 * // => [1, 2, 3, [4], 5]

 */

function flattenDepth(array, depth) {

  var length = array == null ? 0 : array.length;

  if (!length) {

    return [];

  }

  depth = depth === undefined ? 1 : toInteger(depth);

  return baseFlatten(array, depth);

}

module.exports = flattenDepth;