Elixir/phoenix

Question 1

What is def?

Answer 1

def/2. A macro that let’s you define functions

Question 2

What do AST tuples contain?

Answer 2

function name, metadata, and function arguments

Question 3

what is the output of quote do:42

Answer 3

42

Question 4

what is the output of quote do: "Hello"

Answer 4

“Hello”

Question 5

what is the output of quote do: 1 + 2

Question 6

is quote a macro or a function?

Answer 6

macro

Question 7

how do you get the textual code representation from a quoted expression?

Answer 7

Macro.to_string(quote do: sum(1, 2 + 3, 4))

Question 8

Inner join example

Answer 8

Question 9

left join example

Answer 9

Question 10

What is the most common Webserver used with plug?

Answer 10

the Cowboy webservr

Question 11

defp

Answer 11

defp/2 is a macro used to define private functions in the module

Question 12

private functions vs regular functions

Answer 12

private functions cannot be called from other modules

Question 13

how to change the port Phoenix runs on

Answer 13

go to config/dev.exs and change the [port: 4000] section to [port: System.get_env("PORT") || 4000] and then boot up program in terminal like PORT=4444 mix phx.server

Question 14

how to kill Phoenix process in terminal

Answer 14

Ctrl-C a ENTER

Question 16

defmodule

Answer 16

defmodule/2 a macro that lets you define your own modules

Question 17

use

Answer 17

use/2 is a macro

Question 18

what does use translate to?

Answer 18

require and ExUnit.Case.\_\_using\_\_

example:

use ExUnit.Case, async: true

—–> =

require ExUnit.Case

ExUnit.Case.\_\_using\_\_(async: true)

Question 19

require

Answer 19

require/2 is a macro. Requires a module in order to use its macros.

Question 20

How to use the html generator?

Answer 20

$ mix phoenix.gen.html Post posts title:string body:text

Question 21

what does mix phoenix.gen.html create?

Answer 21

model, view, controllers, repository, templates, tests

Question 22

What would you have to do after creating a Post object and related items using the html generator?

Answer 22

add a new endpoint to resources "/posts", PostController

Question 23

How can you see your routes list?

Answer 23

$ mix phoenix.routes

Question 24

where are migration files located?

Answer 24

priv/repo/migrations/

Question 25

mix ecto.something is analogous to what in Rails?

Answer 25

rake db:something

Question 26

What are the four Phoenix generators?

Answer 26

mix mix phoenix.gen.html, mix phoenix.gen.channel, mix phoenix.gen.json, mix phoenix.gen.model