gvaughn

defmodule MyApp.Repo do
  use Ecto.Repo,
    otp_app: :my_app,
    adapter: Ecto.Adapters.Postgres

  require Ecto.Query

  @spec fetch_one(Ecto.Queryable.t(), Keyword.t()) ::
          {:ok, struct()} | {:error, :not_found}
  def fetch_one(queryable, opts \\ []) do

gvaughn

# lib/party_web/components/example_component.ex
defmodule PartyWeb.ExampleComponent do
  @moduledoc """
  An example LiveComponent under test.
  """
  use Phoenix.LiveComponent

  def render(assigns) do
    ~H"""
    <div>

gvaughn

defmodule Mlearning do
  @moduledoc false

  def mods(x) do
    [rem(x, 3), rem(x, 5), rem(x, 15)]
  end

  def fizzbuzz(n) do
    cond do
      rem(n, 15) == 0 -> [0, 0, 1, 0]

gvaughn

defmodule Person do
  defstruct [:name, :age]

  def with do
    {Person.Builder, %{}}
  end

  defmodule Builder do
    def unquote(:'$handle_undefined_function')(:and_with, [{__MODULE__, _acc} = tuple]) do
      tuple

gvaughn

defmodule MyApp.Migration do
  @moduledoc """
  Additional helpers for PostgreSQL.
  """

  import Ecto.Migration, only: [execute: 2]

  defmacro __using__(_) do
    quote do
      use Ecto.Migration

gvaughn

defmodule MasterProxy.Application do

  alias MyApp.Endpoint,        as: MyAppEndpoint
  alias MyApp.UserSocket,      as: MyAppUserSocket
  alias MyOtherApp.Endpoint,   as: MyOtherAppEndpoint
  alias MyOtherApp.UserSocket, as: MyOtherAppUserSocket

  alias Phoenix.LiveReloader.Socket,  as: LiveReloadSocket
  alias Plug.Cowboy

gvaughn

for v<-'yyty',into: "",do: "Happy birthday to #{v>?t&&"you"||"Your Name"}\n"

gvaughn

When does terminate/2 get called in a gen_server?

This is what the [official documentation][1] says about the terminate/2 callback for a gen_server:

This function is called by a gen_server when it is about to terminate. It should be the opposite of Module:init/1 and do any necessary cleaning up. When it returns, the gen_server terminates with Reason. The return value is ignored.

Reason is a term denoting the stop reason and State is the internal state of the gen_server.

Reason depends on why the gen_server is terminating. If it is because another callback function has returned a stop tuple {stop,..}, Reason will have the value specified in that tuple. If it is due to a failure, Reason is the error reason.

gvaughn

defmodule YourAppName.Search do

  # ...

  @doc """
  Queries listings.
  """
  def query_listings(query, current_user) do
    default_scope = from l in Listing, where: l.draft == false or l.user_id == ^current_user.id, order_by: [desc: l.updated_at], limit: 50
    id = _try_integer(query)

gvaughn

defmodule Stack do
  @moduledoc """
  Implement a stack using a linked list to back it. The stack should support
  peek, push, pop, count
  do it in whatever language you want
  """
  defstruct llist: []

  def peek(%Stack{llist: [head | _]}), do: head
  def peek(%Stack{}), do: nil