ETS

Mix.install([
  {:kino, "~> 0.9.0"}
])

ETS

• general purpose data storage
• the owning process of an ETS table needs to be running

https://www.erlang.org/doc/man/ets.html

:ets.new/2

• create a table instance
• data structures
  • :set
  • :ordered_set
  • :bag
  • :duplicated_bag
• access level
  • :public
  • :protected
  • :private
• named table
  • :named_table

https://www.erlang.org/doc/man/ets.html#new-2

:ets.new(:my_ets_set, [:set, :named_table])

:ets.insert/2

• insert an entry

https://www.erlang.org/doc/man/ets.html#insert-2

grouped_users = [
  {1, %{name: "foo", group: :a}},
  {2, %{name: "bar", group: :b}},
  {3, %{name: "baz", group: :a}}
]

# insert data entries
for user <- grouped_users do
  true = :ets.insert(:my_ets_set, user)
end

Kino.ETS.new(:my_ets_set)

:ets.tab2list/1

• dump all entries

https://www.erlang.org/doc/man/ets.html#tab2list-1

:ets.tab2list(:my_ets_set)

:ets.info/1

• return information about a table as a list of tuples

https://www.erlang.org/doc/man/ets.html#info-1

table_info = :ets.info(:my_ets_set)

:ets.lookup/2

• list all objects with a key in a table
• used when IDs are known

https://www.erlang.org/doc/man/ets.html#lookup-2

:ets.lookup(:my_ets_set, 1)