Container holds a map of counters; since we want to update it concurrently from multiple goroutines, we add a `Mutex` to synchronize access. Note that

Example is info extracted from an example file

Let's look at the `List` type from the [previous example](generics) again. In that example we had an `AllElements` method that returned a slice of all

As an example of a generic type, `List` is a singly-linked list with values of any type.

The `parent>child>plant` field tag tells the encoder to nest all `plant`s under `<parent><child>...`

We can use the same technique to sort a slice of values that aren't built-in types.

Plant will be mapped to XML. Similarly to the JSON examples, field tags contain directives for the encoder and decoder. Here we use some special featu

Seg is a segment of an example

Our enum type `ServerState` has an underlying `int` type.

A custom error type usually has the suffix "Error".

A `container` _embeds_ a `base`. An embedding looks like a field without a name.

Here's a basic interface for geometric shapes.

This `person` struct type has `name` and `age` fields.

In this example our state will be owned by a single goroutine. This will guarantee that the data is never corrupted with concurrent access. In order t

For our example we'll implement this interface on `rect` and `circle` types.

We'll use these two structs to demonstrate encoding and decoding of custom types below.

Only exported fields will be encoded/decoded in JSON. Fields must start with capital letters to be exported.