Today I Learned

A Hashrocket project

Count Occurrences in Elixir

Elixir recently introduced an useful couple of functions to count how many times a value appears in an Enumerable. It comes in two formats: frequencies/1 and frequencies_by/2. Here’s an example:

iex> [
...>   %{name: "Falcon", power: "Flight"},
...>   %{name: "Titan Spirit", power: "Flight"},
...>   %{name: "Atom Claw", power: "Strength"},
...>   %{name: "Electro", power: "Electricity Control"},
...>   %{name: "Loki Brain", power: "Telekinesis"},
...> ] |> Enum.frequencies_by(& &1.power)
%{
  "Electricity Control" => 1,
  "Flight" => 2,
  "Strength" => 1,
  "Telekinesis" => 1
}
Looking for help? At Hashrocket, we 💜 Elixir! From our many Elixir client projects, to sponsoring the Chicago Elixir Meetup, to the source code for this application, we are invested in this community. Contact us today to talk about your Elixir project.