Install Phoenix 1.4.0 for MacOS

Install Elixir

$ brew install elixir

Install/Update Mix

$ mix local.hex

Install Phoenix

$ mix archive.install hex phx_new 1.4.0

Create new Phoenix API

$ mix phx.new my-app --no-webpack --no-html

Run Interactive Mode

$ iex -S mix # run recompile() for any change
$ MIX_ENV=test iex -S mix

Seed Data

$ mix run priv/repo/seeds.exs

Create Docs

$ mix docs

DocTests
IEx.pry

Recommended Shortcuts

Add the following code to defp aliases do in mix.exs.

# Aliases are shortcuts or tasks specific to the current project.
# For example, to create, migrate and run the seeds file at once:
#
#     $ mix ecto.setup
#
# See the documentation for `Mix` for more info on aliases.
defp aliases do
  [
    "ecto.setup": ["ecto.create", "ecto.migrate", "run priv/repo/seeds.exs"],
    "ecto.reset": ["ecto.drop", "ecto.setup"],
    "test": ["ecto.create --quiet", "ecto.migrate", "test"]
    s: ["server"], # Start Web Server
    d: ["phx.digest"], # Compile Static Asset
    g: ["deps.get"], # Download Elixir/ Erlang Packages
    db: ["ecto.migrate"], # Database Migration
    r: ["phx.routes"], # Check Routing
    m: ["phx.gen.model"], # Generate Model
  ]
end

Reference

Elixir Official Website
Phoenix Official Website