[Rust] 8.6. HashMap Pt.2 - Updating HashMaps

8.6.0. Chapter Overview Chapter 8 is mainly about common collections in Rust. Rust provides many collection-like data structures, and these collections can hold many values. However, the collections covered in Chapter 8 are different from arrays and tuples. The collections in Chapter 8 are stored on the heap rather than on the stack. That also means their size does not need to be known at compile time; at runtime, they can grow or shrink dynamically. This chapter focuses on three collections: Vector, String, and HashMap (this article). If you find this helpful, please like, bookmark, and follow. To keep learning along, follow this series. 8.6.1. Updating a HashMap A variable-sized HashMap means that the number of key-value pairs can change. However, at any given moment, one key can correspond to only one value. When you want to update data in a HashMap, there are several possible cases: The key you want to update already has a corresponding value in the Has