mix run does run your app. It’s just that when you simply put IO.puts “something” in a file that line is only evaluated in compile-time, it does nothing at runtime. If you want something to get started when you start your app you need to specify that in your mix.exs. Usually you want a top-level … Read more
.ex is for compiled code, .exs is for interpreted code. ExUnit tests, for example, are in .exs files so that you don’t have to recompile every time you make a change to your tests. If you’re writing scripts or tests, use .exs files. Otherwise, just use .ex files and compile your code. As far as … Read more
You can use DateTime.utc_now/0 to get UTC DateTime.
Start your line with #iex:break iex(1)> Enum.each ‘12345’, &(IO.puts(&1″)) …(1)> … …(1)> #iex:break ** (TokenMissingError) iex:1: incomplete expression
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
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