ArrayflattenDeepOn this pageflattenDeep_.flattenDeep(array) # Ⓢ [Ⓣ][1] Ⓝ Recursively flattens array. Since 3.0.0 Arguments array (Array): The array to flatten. Returns (Array): Returns the new flattened array. Example _.flattenDeep([1, [2, [3, [4]], 5]]);// => [1, 2, 3, 4, 5]