Learn Elixir — Create Project And Run it

Create project using tools called mix,

mix new [project_name]

for example, create project “coffees”

mix new coffees

you’ll got output from command line like below

* creating README.md
* creating .gitignore
* creating mix.exs
* creating config
* creating config/config.exs
* creating lib
* creating lib/coffees.ex
* creating test
* creating test/test_helper.exs
* creating test/coffees_test.exs
Your Mix project was created successfully.
You can use "mix" to compile it, test it, and more:
cd coffees
    mix test
Run "mix help" for more commands.

then, go through directory

cd coffees

let’s open using your favorite’s editor :

if you’re using vs code

code .

or if you’re using atom

atom .

open file lib/coffees.ex, you’ll get the content of that file like below :

edit that file, and change the content like below

defmodule Coffees do
  def hello_coffee do
       "hi coffee lovers !"
  end
end

let, try our first elixir program using iex (interactive elixir shell), just typing in command line

iex -S mix

then, try running “hello_coffee” function

Coffees.hello_coffee()

if you got error like this, that’s mean, you not compile elixir’s code yet.

** (UndefinedFunctionError) function Coffees.hello_world/0 is undefined or private. Did you mean one of:
* hello/0
(coffees) Coffees.hello_world()

to fix this, just type

recompile

you’ll got this message

iex(1)> recompile
Compiling 1 file (.ex)
:ok

then, try to rerun the elixir’s program

Coffees.hello_coffee()

if the output are like this,

iex(2)> Coffees.hello_coffee()
"hi coffee lovers !"

Congratulations, you has successfully running your first elixir’s program.