game.js

var buttonColours = ["red", "blue", "green", "yellow"];
var gamePattern = [];
var userClickedPattern = [];
var started = false;
var level = 0;

function nextSequence(){
  userClickedPattern = [];
  var randomNumber = Math.floor(Math.random() * 4);
  var randomChosenColour = buttonColours[randomNumber];
  gamePattern.push(randomChosenColour);
  $("." + randomChosenColour).fadeIn(100).fadeOut(100).fadeIn(100);
  playSound(randomChosenColour);
  level++;
  $("h1").text("Level " + level);
}

$(document).keypress(function(){
  if (!started) {
    $("h1").text("Level 0");
    nextSequence();
    started = true;
  }
});

$(".btn").click(function(){
  var userChosenColour = $(this).attr("id");
  console.log(userChosenColour);
  userClickedPattern.push(userChosenColour);
  playSound(userChosenColour);
  animatePress(userChosenColour);
  checkAnswer(userClickedPattern.length-1);
})

function playSound (name) {
  var audio = new Audio ("sounds/" + name + ".mp3")
  audio.play();
}

function animatePress (currentColour) {
  $("#" + currentColour).addClass("pressed");
  setTimeout(function(){
    $("#" + currentColour).removeClass("pressed");
  }, 100);
}

function checkAnswer(currentLevel){
  if (gamePattern[currentLevel] === userClickedPattern[currentLevel]) {
    console.log("Success");
    if (userClickedPattern.length === gamePattern.length){
      setTimeout(function () {
        nextSequence();
      }, 1000);

    }
  } else {
    console.log("Wrong");
    var error = new Audio ("sounds/wrong.mp3")
    error.play();
    $("body").addClass("game-over");
    setTimeout(function(){
      $("body").removeClass("game-over");
    }, 200);
    $("h1").text("Game Over, Press Any Key to Restart");
    startOver();
  }
}

function startOver (){
  level = 0;
  gamePattern = [];
  userClickedPattern = [];
  started = false;
}