You can run iex -S mix to run iex with the dependencies in your current mix project included.. You can read about this at http://elixir-lang.org/getting-started/mix-otp/introduction-to-mix.html From there you can execute Ecto queries: iex> MyApp.Repo.all(MyApp.User) Running iex -S mix phx.server will also start the phoenix server.
You can use Enum.member?/2 Enum.member?([“foo”, “bar”], “foo”) # true With a tuple you will want to convert to to a list first using Tuple.to_list/1 Tuple.to_list({“foo”, “bar”}) # [“foo”, “bar”]
Keyword List Map/Struct HashDict (deprecated) Duplicate keys yes no no Ordered yes no no Pattern matching yes yes no Performance¹ (Insert) very fast² fast³ fast⁴ Performance¹ (Access) slow⁵ fast³ fast⁴ Keyword lists are lightweight and have a simple structure underneath them, which makes them very flexible. You can think of them as syntax sugar on … Read more
This is a very open question but I will try to illustrate why Elixir/Erlang may be the best platform out there for developing distributed systems (regardless if you are working with microservices). First, let’s start with some background. The Erlang VM and its standard library were designed upfront for building distributed systems and this really … Read more
You shouldn’t stumble on anything you can do in one that you can’t in the other, since you can freely call Elixir code from Erlang and vice-versa. You can even easily mix Erlang and Elixir files in one project. In Elixir: :erlang_module.erlang_function(args) in Erlang: ‘Elixir.ElixirModule’:elixir_function(args)
Check Integer.parse/1 and Float.parse/1.
import Module brings all the Functions and Macros of Module un-namespaced into your module. require Module allows you to use macros of Module but does not import them. (Functions of Module are always available namespaced.) use Module first requires module and then calls the __using__ macro on Module. Consider the following: defmodule ModA do defmacro … Read more
Starting in elixir 1.2 there is an i command in iex that will list the type and more of any Elixir variable. iex> foo = “a string” iex> i foo Term “a string” Data type BitString Byte size 8 Description This is a string: a UTF-8 encoded binary. It’s printed surrounded by “double quotes” because … Read more
If you just want to join some arbitrary list: “StringA” <> ” ” <> “StringB” or just use string interpolation: “#{a} #{b}” If your list size is arbitrary: Enum.join([“StringA”, “StringB”], ” “) … all of the solutions above will return “StringA StringB”
There is a simple alternative that does not require any external dependencies: defmodule MyApp.Periodically do use GenServer def start_link(_opts) do GenServer.start_link(__MODULE__, %{}) end def init(state) do schedule_work() # Schedule work to be performed at some point {:ok, state} end def handle_info(:work, state) do # Do the work you desire here schedule_work() # Reschedule once more … Read more