rustlings/exercises/README.md

# Exercise to Book Chapter mapping

| Exercise               | Book Chapter        |
| ---------------------- | ------------------- |
| variables              | §3.1                |
| functions              | §3.3, §13.1         |
| if                     | §3.5                |
| primitive_types        | §3.2, §4.3          |
| vecs                   | §8.1                |
| move_semantics         | §4.1-2              |
| structs                | §5.1, §5.3          |
| enums                  | §6, §18.3           |
| strings                | §8.2                |
| modules                | §7                  |
| hashmaps               | §8.3                |
| options                | §10.1               |
| error_handling         | §9                  |
| generics               | §10                 |
| traits                 | §10.2               |
| lifetimes              | §10.3               |
| tests                  | §11.1               |
| iterators              | §13.2-4             |
| smart_pointers         | §15, §16.3          |
| threads                | §16.1-3             |
| macros                 | §19.5               |
| clippy                 | §21.4               |
| conversions            | n/a                 |