# Elixir Today: Create a Hollow Square using Elixir

### Process

- create a file named "hollow.ex"
- write the code

```
hollow = fn number ->
  for i when i < number <- 0..number do
    for j when j < number <- 0..number do
      if i === 0 || i === number - 1 do
        "*"
      else
        if j === 0 || j === number - 1 do
          "*"
        else
          " "
        end
      end
    end
  end
  |> Enum.into("", fn string ->
    string = Enum.join(string)
    "#{string}\n"
  end)
end

IO.puts(hollow.(10))
IO.puts(hollow.(5))

```

- run `elixir hollow.ex` on your terminal.

### Result

```
**********
*        *
*        *
*        *
*        *
*        *
*        *
*        *
*        *
**********

*****
*   *
*   *
*   *
*****
```


> Happy Coding!