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ng g store AppState --root --module app.module.ts

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interface Action {
  type: string;
  payload?: any;
}

interface Reducer<T> {
  (state: T, action: Action): T
}

interface ListenerCallback {

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RxJS
RxJS is a library for composing asychronous and event-based programs by using observable sequences.
It combines the Observer pattern with the Iterator pattern and functional programming with collections.
Essential conecpts:
- Observable: (event stream)
  represents the idea of an invokable collection of furure values or events.
- Observer (callback)
  is a collection of callbacks that knows how to listen to values delivered by the Observable
- Subscription (execution)
  represents the execution of an Observable, is primarily useful for cancelling the execution

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# run composer from command line using docker
docker run --rm -it -v $PWD:/app -v $SSH_AUTH_SOCK:/ssh-auth.sock -v /etc/passwd:/etc/passwd:ro -v /etc/group:/etc/group:ro -u $(id -u):$(id -g) -e SSH_AUTH_SOCK=/ssh-auth.sock composer install
    


# run php from command line using docker
docker run -it --rm -p 8000:8000 -v $(pwd):/app -w /app php:cli php artisan serve --host=0.0.0.0


# docker-composer.yml

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const spy = jest.spyOn(MODULE, 'myFunction').mockImplementation(() => Promise.resolve({payload: 2}));

spy.mockRestore()

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# enable vivaldi codecs

# 1. install chromium codecs extra
sudo dnf install chromium-libs-media-freeworld.x86_64 -

# 2. move old vivaldi libffmpeg
sudo mv /opt/vivaldi/lib/libffmpeg.so /opt/vivaldi/lib/libffmpeg.so.backup

# 3. link vivaldi ffmpeg to chromium ffmpeg 
sudo ln -s /usr/lib64/chromium-browser/libffmpeg.so /opt/vivaldi/lib/libffmpeg.so

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export default function createAsyncAction (type, fn) {
  return (...args) => async (dispatch) => {
    dispatch({
      type: `${type}_STARTED`,
      payload: args
    });
    let result;
    try {
      result = await fn(...args);
    } catch (error) {

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import { increaseCount, reducer, store } from './counter';

describe('Counter', () => {
  it('should have a default state', () => {
    const result = reducer();
    expect(result.count).toEqual(0);
  });

  it('should increase the count', () => {
    const action = increaseCount();

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sudo dnf clean all

sudo dnf -y install gstreamer-plugins-base gstreamer1-plugins-base gstreamer-plugins-bad gstreamer-plugins-ugly gstreamer1-plugins-ugly gstreamer-plugins-good-extras gstreamer1-plugins-good-extras gstreamer1-plugins-bad-freeworld ffmpeg gstreamer-ffmpeg

sudo dnf install rhythmbox -y

sudo dnf config-manager --add-repo=http://negativo17.org/repos/fedora-spotify.repo

sudo dnf install spotify -y

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sudo dnf clean all

# Install the dnf-plugins-core package which provides the commands to manage your DNF repositories from the command line.
sudo dnf -y install dnf-plugins-core

# Use the following command to set up the stable repository.
sudo dnf config-manager --add-repo https://download.docker.com/linux/fedora/docker-ce.repo

# Enable the edge and test repositories.
sudo dnf config-manager --set-enabled docker-ce-edge