# The Ninth Song Won't Fit: Growing Arrays

A playlist of 8 slots crashes on the 9th song. Find a way to let it grow to a million songs without every add slowing down, and meet the structure inside every language's list: the growing array.

![Cheat sheet: The Ninth Song Won't Fit: Growing Arrays](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/2efd2b669f564f90814d6b6ea3ba846d.webp)

- Category: Data Structures
- Level: Apprentice
- Tags: Array (data-structures), Capacity, data structures, Dynamic Array
- Updated: November 3, 2026

Source: https://www.ask-codey.com/cheat-sheets/ds-dynamic-arrays-cheat-sheet