If you find this helpful, please like, bookmark, and follow. To keep learning along, follow this series. 10.2.1 What Are Generics The main purpose of generics is to improve code reusability . They are suitable for handling repeated-code problems, and can also be seen as separating data from algorithms . Generics are abstract substitutes for concrete types or other attributes. In other words, generic code is not the final code you write; it is more like a template with some placeholders . The compiler replaces those placeholders with concrete types at compile time. Let’s look at an example: fn largest < T > ( list : & [ T ]) -> T { //...... } Enter fullscreen mode Exit fullscreen mode This function definition uses a generic type parameter . T is the so-called “placeholder.” When you write the code, T can represent any type, but during compilation the compiler replaces T with a concrete type based on the actual usage. This process is called monomorphization . T is the generic type parameter.…