Learning Exercise
Most programs have dependencies on some libraries. Managing those by hand can be a pain. Luckily, the Rust ecosystem comes standard with cargo! cargo can manage dependencies for a project.
You will often see external packages being referred to as "crates" in Rust. A crate is a compilation unit in Rust. A crate can be compiled into a binary or into a library.
Most of the time, adding an external dependency is as simple as adding a line to your Cargo.toml file.
In this exercise, enum-iterator and int-enum dependencies were added for you.
If you want to build something using a Raspberry Pi, you'll probably use resistors. For this exercise, you need to know two things about them:
To get around this problem, manufacturers print color-coded bands onto the resistors to denote their resistance values. Each band has a position and a numeric value.
The first 2 bands of a resistor have a simple encoding scheme: each color maps to a single number.
In this exercise you are going to create a helpful program so that you don't have to remember the values of the bands.
These colors are encoded as follows:
The goal of this exercise is to create a way to:
For task number one, you will need the external crate int-enum and for task number three, you'll need enum-iterator.
They're both already included in this exercise's Cargo.toml.
Be sure to check the crates' documentation to learn how to use them.
You can look into the default implementation of the Debug trait for Enums to complete task number two.
Mnemonics map the colors to the numbers, that, when stored as an array, happen to map to their index in the array: Better Be Right Or Your Great Big Values Go Wrong.
More information on the color encoding of resistors can be found in the Electronic color code Wikipedia article
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