> For the complete documentation index, see [llms.txt](https://openai.gitbook.io/code-cheatsheets/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://openai.gitbook.io/code-cheatsheets/all/elixir/collections/structs.md).

# Structs

Structs are extensions built on top of maps that provide default values and compile-time guarantees that only the defined fields exist.

Structs are **bare** maps which means you can't enumerate or \[] a struct. But you can use `Map.` functions

## Creating

```elixir
defmodule User do
    defstruct name: "John", age: 27
end
```

```elixir
iex> %User{}
%User{age: 27, name: "John"}
iex> %User{name: "Jane"}
%User{age: 27, name: "Jane"}
```