initial commit

lib/demo/application.ex

@@ -0,0 +1,36 @@
+defmodule Demo.Application do
+  # See https://hexdocs.pm/elixir/Application.html
+  # for more information on OTP Applications
+  @moduledoc false
+
+  use Application
+
+  @impl true
+  def start(_type, _args) do
+    children = [
+      # Start the Ecto repository
+      Demo.Repo,
+      # Start the Telemetry supervisor
+      DemoWeb.Telemetry,
+      # Start the PubSub system
+      {Phoenix.PubSub, name: Demo.PubSub},
+      # Start the Endpoint (http/https)
+      DemoWeb.Endpoint
+      # Start a worker by calling: Demo.Worker.start_link(arg)
+      # {Demo.Worker, arg}
+    ]
+
+    # See https://hexdocs.pm/elixir/Supervisor.html
+    # for other strategies and supported options
+    opts = [strategy: :one_for_one, name: Demo.Supervisor]
+    Supervisor.start_link(children, opts)
+  end
+
+  # Tell Phoenix to update the endpoint configuration
+  # whenever the application is updated.
+  @impl true
+  def config_change(changed, _new, removed) do
+    DemoWeb.Endpoint.config_change(changed, removed)
+    :ok
+  end
+end

lib/demo/funcs.ex

@@ -0,0 +1,15 @@
+defmodule Funcs do
+
+  # Naive, slow and buggy implementation:
+  def fib(0), do: 0
+  def fib(1), do: 1
+  def fib(n), do: fib(n-1) + fib(n-2)
+
+  # Fast version:
+  #  def fib(n) when not is_number(n) or n < 0, do: raise("arg!")
+  #  def fib(n), do: fib(0, 1, n)
+  #
+  #  def fib(a, b, 0), do: a
+  #  def fib(a, b, n), do: fib(b, a+b, n-1)
+  
+end

lib/demo/funcs.ex~

@@ -0,0 +1,10 @@
+defmodule Funcs do
+
+  def fib(n) when not is_number(n) or n < 0, do: raise("arg!")
+  def fib(n), do: fib(0, 1, n)
+
+  def fib(a, b, 0), do: a
+  def fib(a, b, n), do: fib(b, a+b, n-1)
+  
+  
+end

lib/demo/mailer.ex

@@ -0,0 +1,3 @@
+defmodule Demo.Mailer do
+  use Swoosh.Mailer, otp_app: :demo
+end

lib/demo/repo.ex

@@ -0,0 +1,5 @@
+defmodule Demo.Repo do
+  use Ecto.Repo,
+    otp_app: :demo,
+    adapter: Ecto.Adapters.SQLite3
+end