Alternative $this->config>set_item($item, $value)

Thanks for the reply. It seems that it didn't work to push array to my public $item = [...];. Here's my code:

app\config\Packages

PHP Code:

<?php namespace Config;

use CodeIgniter\Config\BaseConfig;

class Packages extends BaseConfig
{
  public $footer_js = ['nuxt.js', 'jquery.js', 'idk.js'];
  // ......
} 


app\Controllers\Test

PHP Code:

<?php namespace App\Controllers;

class Test extends BaseController
{
    public function index()
    {
        $ci = new \Config\Packages();

        $ci->footer_js = 'vue.js';

        foreach($ci->footer_js as $v)
        {
            echo $v;
            echo '<br/>';
        } 


The output should show nuxt.js, jquery.js, idk.js, and vue.js. But instead, it just show only vue.js. 

In real case, I really want to dynamically add Javascript files to footer page. I have this helper works on CI3, but I'm still confused how can I make it work on CI4-rc. Thank you!

-------

All the config files are classes where all the properties are public. That means that once you create an instance of a config you can modify the properties however you see fit.

PHP Code:

<?php namespace App\Controllers;

use Config;

class Home extends BaseController
{
    public function index()
    {
       $viewConfig = new Config\View();
       $viewConfig->saveData = false;
       // do stuff
      }
} 


You can dynamically add properties to the class

PHP Code:

$config = new Config\App();
$config->adHoc = ["Hello ", "World", "!"];
foreach ($viewConfig->adHoc as $value)
{
    echo $value;  // Hello World!
}