The Complete Rust Programming Reference Guide

Internal arrays

Arrays are defined as data structures that have a known size at compile time. Rust takes this very seriously, and the array constructor will only take constants to denominate size in an array. [0u8; 4] will work, but let my_array_size = 2 * 2; [0u8; my_array_size] won't.

So, how do you dynamically reallocate a new array then? In Rust, there is also something called slices, which are views into a sequence data structure, akin to an array. These are a great fit when stored inside a Box pointer: allocated on the heap, it has all the benefits of an array with a dynamic size.

As previously mentioned, this implementation goes with Java's ArrayList growth strategy and increases its size by at least 50% each time more capacity is ...