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HTML

              
                <script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>

<!-- 

Hello Camper!

For now, the test suite only works in Chrome! Please read the README below in the JS Editor before beginning. Feel free to delete this message once you have read it. Good luck and Happy Coding! 

- The freeCodeCamp Team 

-->

<div id="app-root"></div>
<div id="modal-root"></div>
              
            
!

CSS

              
                body {
  margin-top: 40px
}

#modal-root {
  position: relative;
  z-index: 999;
}

.modal-div {
  background-color: rgba(0,0,0,0.5);
  position: fixed;
  height: 100%;
  width: 100%;
  top: 0;
  left: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}


              
            
!

JS

              
                // !! IMPORTANT README:

// You may add additional external JS and CSS as needed to complete the project, however the current external resource MUST remain in place for the tests to work. BABEL must also be left in place. 

/***********
INSTRUCTIONS:
  - Select the project you would 
    like to complete from the dropdown 
    menu.
  - Click the "RUN TESTS" button to
    run the tests against the blank 
    pen.
  - Click the "TESTS" button to see 
    the individual test cases. 
    (should all be failing at first)
  - Start coding! As you fulfill each
    test case, you will see them go   
    from red to green.
  - As you start to build out your 
    project, when tests are failing, 
    you should get helpful errors 
    along the way!
    ************/

// PLEASE NOTE: Adding global style rules using the * selector, or by adding rules to body {..} or html {..}, or to all elements within body or html, i.e. h1 {..}, has the potential to pollute the test suite's CSS. Try adding: * { color: red }, for a quick example!

// Once you have read the above messages, you can delete all comments. 

//Constants where the application and its modal components will be rendered to in the actual DOM.
const appRoot = document.getElementById("app-root");

const modalRoot = document.getElementById("modal-root");

//Arrays:

//This is the array that deals with the styling for each drum machine.
const themesForDrumMachine = [{id: "starWars",
                                     movieBanner: "https://raw.githubusercontent.com/TazExprez/Logos/master/StarWars.jpg",
                                     leftArrowButtonColor: "#E4B77D",
                                     leftArrowButtonHoverColor: "yellow",
                                     rightArrowButtonColor: "#E4B77D",
                                     rightArrowButtonHoverColor: "yellow",
                                     imageBorderColor: "#E4B77D",
                                     bodyBackgroundColor: 'url("https://raw.githubusercontent.com/TazExprez/Logos/master/StarWarsBackground.jpg")',
                                     fontFamily: "StarWarsFont",
                                     arrowSound: "https://raw.githubusercontent.com/TazExprez/Logos/master/StarWarsArrowSound.mp3",
                                     moviePhrase: "https://raw.githubusercontent.com/TazExprez/Logos/master/StarWarsPhrase.mp3",
                                     youTubeVideoSource: "https://www.youtube.com/embed/v5CA6rK2aLQ?enablejsapi=1&version=3&playerapiid=ytplayer&rel=0",
                                     youTubeVideoDivBackgroundColor: "#E4B77D"},
                                   {id: "schindlersList",
                                     movieBanner: "https://raw.githubusercontent.com/TazExprez/Logos/master/SchindlersList.jpg",
                                     leftArrowButtonColor: "white",
                                     leftArrowButtonHoverColor: "#BB3F3F",
                                     rightArrowButtonColor: "white",
                                     rightArrowButtonHoverColor: "#BB3F3F",
                                     imageBorderColor: "white",
                                     bodyBackgroundColor: 'url("https://raw.githubusercontent.com/TazExprez/Logos/master/SchindlersListBackground.jpg")',
                                     fontFamily: "SchindlersListFont",
                                     arrowSound: "https://raw.githubusercontent.com/TazExprez/Logos/master/SchindlersListArrowSound.mp3",
                                     moviePhrase: "https://raw.githubusercontent.com/TazExprez/Logos/master/SchindlersListPhrase.mp3",
                                     youTubeVideoSource: "https://www.youtube.com/embed/sFSWlfZ4CXM?enablejsapi=1&version=3&playerapiid=ytplayer&rel=0",
                                     youTubeVideoDivBackgroundColor: "white"},
                                   {id: "batman",
                                    movieBanner: "https://raw.githubusercontent.com/TazExprez/Logos/master/Batman.jpg",
                                    leftArrowButtonColor: "lightblue",
                                    leftArrowButtonHoverColor: "white", 
                                    rightArrowButtonColor: "lightblue",
                                    rightArrowButtonHoverColor: "white",
                                    imageBorderColor: "white",
                                    bodyBackgroundColor: 'url("https://raw.githubusercontent.com/TazExprez/Logos/master/BatmanBackground.jpg")',
                                    fontFamily: "BatmanFont",
                                    arrowSound: "https://raw.githubusercontent.com/TazExprez/Logos/master/BatmanArrowSound.mp3",
                                    moviePhrase: "https://raw.githubusercontent.com/TazExprez/Logos/master/BatmanPhrase.mp3",
                                    youTubeVideoSource: "https://www.youtube.com/embed/n_Klu8YTub8?enablejsapi=1&version=3&playerapiid=ytplayer&rel=0", 
                                    youTubeVideoDivBackgroundColor: "white"},
                                   {id: "rocky",
                                    movieBanner: "https://raw.githubusercontent.com/TazExprez/Logos/master/Rocky.jpg",
                                    leftArrowButtonColor: "red",
                                    leftArrowButtonHoverColor: "white", 
                                    rightArrowButtonColor: "blue",
                                    rightArrowButtonHoverColor:"white",
                                    imageBorderColor: "white",
                                    bodyBackgroundColor: 'url("https://raw.githubusercontent.com/TazExprez/Logos/master/RockyBackground2.jpg")',
                                    fontFamily: "RockyFont",
                                    arrowSound: "https://raw.githubusercontent.com/TazExprez/Logos/master/RockyArrowSound.mp3",
                                    moviePhrase: "https://raw.githubusercontent.com/TazExprez/Logos/master/RockyPhrase.mp3",
                                    youTubeVideoSource: "https://www.youtube.com/embed/GVLSIRItfKY?enablejsapi=1&version=3&playerapiid=ytplayer&rel=0", 
                                    youTubeVideoDivBackgroundColor: "white"}];

const fullTracks = [{id: "starWarsFullTrack", fullTrack: "https://raw.githubusercontent.com/TazExprez/Logos/master/IMFullTrack.mp3"},
                   {id: "schindlersListFullTrack", fullTrack: "https://raw.githubusercontent.com/TazExprez/Logos/master/SLFullTrack.mp3"},
                   {id: "batmanFullTrack", fullTrack: "https://raw.githubusercontent.com/TazExprez/Logos/master/TDKFullTrack.mp3"},
                   {id: "rockyFullTrack", fullTrack: "https://raw.githubusercontent.com/TazExprez/Logos/master/GTDFullTrack.mp3"}]

//This is the array that contains all of the properties of each drum pad.
const drumPadContent = [[{id: "Q", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/IMTrack1.mp3", keyboardKey: 81},
                                {id: "W", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/IMTrack2.mp3", keyboardKey: 87},
                                {id: "E", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/IMTrack3.mp3", keyboardKey: 69},
                                {id: "A", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/IMTrack4.mp3", keyboardKey: 65},
                                {id: "S", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/IMTrack5.mp3", keyboardKey: 83},
                                {id: "D", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/IMTrack6.mp3", keyboardKey: 68},
                                {id: "Z", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/IMTrack7.mp3", keyboardKey: 90},
                                {id: "X", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/IMTrack8.mp3", keyboardKey: 88},
                                {id: "C", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/IMTrack9.mp3", keyboardKey: 67}],
                               [{id: "Q", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/SLTrack1.mp3", keyboardKey: 81},
                                {id: "W", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/SLTrack2.mp3", keyboardKey: 87},
                                {id: "E", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/SLTrack3.mp3", keyboardKey: 69},
                                {id: "A", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/SLTrack4.mp3", keyboardKey: 65},
                                {id: "S", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/SLTrack5.mp3", keyboardKey: 83},
                                {id: "D", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/SLTrack6.mp3", keyboardKey: 68},
                                {id: "Z", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/SLTrack7.mp3", keyboardKey: 90},
                                {id: "X", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/SLTrack8.mp3", keyboardKey: 88},
                                {id: "C", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/SLTrack9.mp3", keyboardKey: 67}],
                               [{id: "Q", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/TDKTrack1.mp3", keyboardKey: 81},
                                {id: "W", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/TDKTrack2.mp3", keyboardKey: 87},
                                {id: "E", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/TDKTrack3.mp3", keyboardKey: 69},
                                {id: "A", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/TDKTrack4.mp3", keyboardKey: 65},
                                {id: "S", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/TDKTrack5.mp3", keyboardKey: 83},
                                {id: "D", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/TDKTrack6.mp3", keyboardKey: 68},
                                {id: "Z", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/TDKTrack7.mp3", keyboardKey: 90},
                                {id: "X", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/TDKTrack8.mp3", keyboardKey: 88},
                                {id: "C", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/TDKTrack9.mp3", keyboardKey: 67}],
                               [{id: "Q", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/GTDTrack1.mp3", keyboardKey: 81},
                                {id: "W", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/GTDTrack2.mp3", keyboardKey: 87},
                                {id: "E", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/GTDTrack3.mp3", keyboardKey: 69},
                                {id: "A", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/GTDTrack4.mp3", keyboardKey: 65},
                                {id: "S", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/GTDTrack5.mp3", keyboardKey: 83},
                                {id: "D", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/GTDTrack6.mp3", keyboardKey: 68},
                                {id: "Z", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/GTDTrack7.mp3", keyboardKey: 90},
                                {id: "X", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/GTDTrack8.mp3", keyboardKey: 88},
                                {id: "C", trackSource: "https://raw.githubusercontent.com/TazExprez/Logos/master/GTDTrack9.mp3", keyboardKey: 67}]];

//This is the array that contains all of the audio that is played when the user switches the level of effects.
const effectsLevelChangeConfirmationSounds = [{id: "moreEffects",
                                           goToMoreEffectsSound: "https://raw.githubusercontent.com/TazExprez/Logos/master/Applause.mp3"},
                                          {id: "noMoreEffects",
                                           leaveMoreEffectsSound: "https://raw.githubusercontent.com/TazExprez/Logos/master/DuckHuntDogLaugh.mp3"},
                                          {id: "extremeEffects",
                                           goToExtremeEffectsSound: "https://raw.githubusercontent.com/TazExprez/Logos/master/MichaelBufferLGRTR.mp3"},
                                          {id: "noExtremeEffects",
                                           leaveExtremeEffectsSound: "https://raw.githubusercontent.com/TazExprez/Logos/master/KWSPleaseDontGo.mp3"}];



//Redux:

const SELECTED_THEME_AND_MUSIC_SLOT = 'SELECTED_THEME_AND_MUSIC_SLOT';

const DEFAULT_SELECTED_THEME_AND_MUSIC_SLOT = 0;

const CHANGE_DISPLAY = 'CHANGE_DISPLAY';

const DEFAULT_DISPLAY = 'TESTING';

const KEYBOARD_KEY_PRESSED = 'KEYBOARD_KEY_PRESSED';

const DEFAULT_KEYBOARD_KEY_PRESSED = null;

//This is the action creator function for changing the theme of the drum pad.
const selectedThemeAndMusicSlotActionCreator = (themeAndMusicSlot) => ({
  type: SELECTED_THEME_AND_MUSIC_SLOT,
  selectedThemeAndMusicSlot: themeAndMusicSlot
});

//This is the reducer function that returns the part of the state that selects the current drum machine theme.
const selectedThemeAndMusicSlotReducer = (state = DEFAULT_SELECTED_THEME_AND_MUSIC_SLOT, action) => {
  switch(action.type) {
    case SELECTED_THEME_AND_MUSIC_SLOT:
      return action.selectedThemeAndMusicSlot;
    default:
      return state;
  }
};

//This is the action creator function for selecting the track to play.
const keyboardKeyPressedActionCreator = (keyboardKeySelected) => ({
  type: KEYBOARD_KEY_PRESSED,
  keyboardKeyPressed: keyboardKeySelected
});

//This is the reducer function that returns the part of the state that selects the track to play.
const keyboardKeyPressedReducer = (state = DEFAULT_KEYBOARD_KEY_PRESSED, action) => {
  switch(action.type) {
    case KEYBOARD_KEY_PRESSED:
      return action.keyboardKeyPressed;
    default:
      return state;
  }
};

//This is the action creator function for selecting what to show on the drum machine display.
const changeDisplayActionCreator = (displayItemChosen) => ({
  type: CHANGE_DISPLAY,
  specificItemToDisplay: displayItemChosen
});

//This is the reducer function that returns the part of the state that selects what to show on the drum machine display.
const changeDisplayReducer = (state = DEFAULT_DISPLAY, action) => {
  switch(action.type) {
    case CHANGE_DISPLAY:
      return action.specificItemToDisplay;
    default:
      return state;
  }
};

const rootReducer = Redux.combineReducers({
  themeAndMusicSlot: selectedThemeAndMusicSlotReducer,
  keyboard: keyboardKeyPressedReducer,
  display: changeDisplayReducer
});

const store = Redux.createStore(rootReducer);

//React:

//This is the component that constructs all of the modal boxes.
const Modal = (props) => {
  const modalDivElement = document.createElement('div');
  
  React.useEffect(() => {
    modalRoot.appendChild(modalDivElement);
    
    return () => {modalRoot.removeChild(modalDivElement)}
  }, []);
  
  return ReactDOM.createPortal(props.children, modalDivElement);
}

const ThemeBanner = () => {
  const themeAndMusicSlot = ReactRedux.useSelector(state => state.themeAndMusicSlot, ReactRedux.shallowEqual);
  
  return(
    <div className="ThemeBanner">
      <img className="ThemeBanner-theme-image" src={themesForDrumMachine[themeAndMusicSlot].movieBanner}/>
    </div>
  );
}

const LeftArrow = () => {
  const audioRef = React.useRef(null);
  
  const dispatch = ReactRedux.useDispatch();
  
  const pressedKeyboardKey = ReactRedux.useSelector(state => state.keyboard, ReactRedux.shallowEqual);
  
  const keyboardKey = 37;
  
  let themeAndMusicSlot = ReactRedux.useSelector(state => state.themeAndMusicSlot, ReactRedux.shallowEqual);
  
  const changeThemeAndMusicSlotToLeft = () => {
    if (themeAndMusicSlot === 0) {
      themeAndMusicSlot = themesForDrumMachine.length - 1;
    }
    else {
      themeAndMusicSlot -= 1;
    }
    
    setTimeout(() => {
      audioRef.current.play();
    }, 1);
  
    dispatch(selectedThemeAndMusicSlotActionCreator(themeAndMusicSlot));
  }
  
  //This if statement is executed by keyboard key presses.
  if (pressedKeyboardKey === keyboardKey) {
    changeThemeAndMusicSlotToLeft();
    
    dispatch(keyboardKeyPressedActionCreator(DEFAULT_KEYBOARD_KEY_PRESSED));
  }
  
  return(
    <div className="LeftArrow">
      <h4 onClick={() => changeThemeAndMusicSlotToLeft()}>Left Arrow</h4>
      
      <audio ref={audioRef} className="ArrowSound" src={themesForDrumMachine[themeAndMusicSlot].arrowSound} type="audio/mpeg" crossOrigin="anonymous" />
    </div>
  );  
}

const RightArrow = () => {
  const audioRef = React.useRef(null);
  
  const dispatch = ReactRedux.useDispatch();
  
  const pressedKeyboardKey = ReactRedux.useSelector(state => state.keyboard, ReactRedux.shallowEqual);
  
  const keyboardKey = 39;
  
  let themeAndMusicSlot = ReactRedux.useSelector(state => state.themeAndMusicSlot, ReactRedux.shallowEqual);
  
  const changeThemeAndMusicSlotToRight = () => {
    if (themeAndMusicSlot === themesForDrumMachine.length - 1) {
      themeAndMusicSlot = 0;
    }
    else {
      themeAndMusicSlot += 1;
    }
    
    setTimeout(() => {
      audioRef.current.play();
    }, 1);
    
    dispatch(selectedThemeAndMusicSlotActionCreator(themeAndMusicSlot));
  }
  
  //This if statement is executed by keyboard key presses.
  if (pressedKeyboardKey === keyboardKey) {
    changeThemeAndMusicSlotToRight();
    
    dispatch(keyboardKeyPressedActionCreator(DEFAULT_KEYBOARD_KEY_PRESSED));
  }
    
  return(
    <div className="RightArrow">
      <h4 onClick={() => changeThemeAndMusicSlotToRight()}>Right Arrow</h4>
      
      <audio ref={audioRef} className="ArrowSound" src={themesForDrumMachine[themeAndMusicSlot].arrowSound} type="audio/mpeg" crossOrigin="anonymous" />
    </div>
  );
}

const ThemeAndMusicSelection = () => {
  return(
    <div className="ThemeAndMusicSelection">
      <LeftArrow />
      
      <ThemeBanner />
      
      <RightArrow />
    </div>
  );
}

//This is the functional component that display which key is currently being pressed.
const Display = () => {
  const display = ReactRedux.useSelector(state => state.display, ReactRedux.shallowEqual);
  
  return(
    <div className="Display" id="display">
      {display} 
    </div>
  );
}

//This is the functinal component for each drum pad.
const DrumPad = ({id, track, keyboardKey}) => {
  const audioRef = React.useRef(null);
  
  const dispatch = ReactRedux.useDispatch();
  
  const pressedKeyboardKey = ReactRedux.useSelector(state => state.keyboard, ReactRedux.shallowEqual);
  
  const playAudioAndChangeDisplay = () => {
    audioRef.current.play();
    
    //This dispatch function changes what is displayed in the drum machine's display.
    dispatch(changeDisplayActionCreator(id));
  }
  
  //This if statement is executed by keyboard key presses.
  if (pressedKeyboardKey === keyboardKey) {
    playAudioAndChangeDisplay();
    
    dispatch(keyboardKeyPressedActionCreator(DEFAULT_KEYBOARD_KEY_PRESSED));
  }
  
  return(
    <div className="DrumPad">
      <div id={"drum-pad-" + id} className="drum-pad" onClick={() => playAudioAndChangeDisplay()}>
        {id}
        
        <audio ref={audioRef} id={id} className="clip" src={track} type="audio/mpeg" crossOrigin="anonymous" />
      </div>
    </div>
  );
}

//This is the functional component for the drum machine.
const DrumMachine = () => {
  const themeAndMusicSlot = ReactRedux.useSelector(state => state.themeAndMusicSlot, ReactRedux.shallowEqual);
  
  const [modalOnOrOff, setModalOnOrOff] = React.useState(false)
  
  const youTubeModal = modalOnOrOff ? (
    <Modal>
      <div className="modal-div">
        <span onClick={() => setModalOnOrOff(false)}>
          X
        </span>
        
        <iframe id="youtube-video-iframe" width="560" height="315" src={themesForDrumMachine[themeAndMusicSlot].youTubeVideoSource} frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="true" allowscriptaccess="always"></iframe>
      </div>
    </Modal>
  ) : null;
  
  return(
    <div className="DrumMachine" id="drum-machine">
      <div className="DrumMachine-display-div">
        <Display />
      </div>
      
      <div className="DrumMachine-control-buttons-div">
        <div id="DrumMachine-youtube-button-div" onClick={() => setModalOnOrOff(true)}>
          Open YouTube Window
        </div>
      </div>
      
      <div className="DrumMachine-drum-pads-div">
        {
          //This is where all of the drum pads are rendered.
          drumPadContent[themeAndMusicSlot].map(eachDrumPad => (
            <DrumPad 
              key={eachDrumPad.id} 
              id={eachDrumPad.id} 
              track={eachDrumPad.trackSource} 
              keyboardKey={eachDrumPad.keyboardKey}
            />
          ))
        }
      </div>
      
      {youTubeModal}
    </div>
  );
}

//This is the main functional component that renders the drum machine.
const App = () => {
  /*Remember to change this to true before you are done.*/ const [modalOn, setModalOff] = React.useState(false);
  const appRef = React.useRef(null);
  
  const dispatch = ReactRedux.useDispatch();
  
  const welcomeAndHelpModal = modalOn ? (
    <Modal>
      <div className="modal-div">
        <div>
          Hello World!
        </div>
        
        <button onClick={() => setModalOff(false)}>
          Turn Off
        </button>
      </div>
    </Modal>
  ) : null;
  
  //This is the function that plays a drum pad beat if the corresponding keyboard key is pressed.
  const keyboardPress = (event) => {
    dispatch(keyboardKeyPressedActionCreator(event.keyCode)); 
  } 
  
  //This causes the App component to be focused when the application is first loaded.
  /*React.useEffect(() => {
    appRef.current.focus();
  });*/
  
  return(
    <div ref={appRef} className="App" tabIndex="0" onKeyDown={() => keyboardPress(event)}>
      <ThemeAndMusicSelection />
      
      <DrumMachine />
      
      {welcomeAndHelpModal}
    </div>
  );
}

//React-Redux:
const Provider = ReactRedux.Provider;

//This ReactDOM.render() will render your React component to a div with an id of root in the HTML body element.
ReactDOM.render(<Provider store={store}><App /></Provider>, appRoot);
              
            
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