---
title: Erlang ETS
category: Elixir
layout: 2017/sheet
weight: -1
---

## ETS

### Usage

```elixir
iex> table = :ets.new(:my_table, [])
     8211
```

```elixir
iex> :ets.insert(table, {:fruit, "Apple"})
iex> :ets.lookup(table, :fruit)
     [{:fruit, "Apple"}]
```

```elixir
iex> :ets.delete(table)
iex> :ets.delete_all_objects(table)
```

### Flags

```elixir
iex> table = :ets.new(:my_table, [:set, :protected])
```
{: .-setup}

| `:set` | no duplicate keys (or: `:ordered_set`, `:bag`, `:duplicate_bag`) |
| `:protected` | only this process can use it (or: `:public`, `:private`) |

### Ordered sets

```elixir
:ets.first(table)
:ets.last(table)
:ets.next(table, key)
:ets.prev(table, key)
```

## References
{: .-one-column}

* <http://erlang.org/doc/man/ets.html>
* <http://learnyousomeerlang.com/ets>