game.js

var buttonColours = ["red", "blue", "green", "yellow"];

var gamePattern = [];

var userClickedPattern = [];

var started = false;

var level = 0;


$(document).keypress(function() {
  if (!started) {
    $("#level-title").text("Level " + level);
    nextSequence();
    started = true;
  }
});

$(".btn").click(function() {

  var userChosenColour = $(this).attr("id");
  userClickedPattern.push(userChosenColour);

  playSound(userChosenColour);
  animatePress(userChosenColour);
  checkAnswer(userClickedPattern.length-1);
});

function nextSequence() {
  
  userClickedPattern=[];
  
  level+=1;

  $("#level-title").text("Level " + level);

  var randomNumber = Math.floor(Math.random() * 4);
  var randomChosenColour = buttonColours[randomNumber];
  gamePattern.push(randomChosenColour);

  $("#" + randomChosenColour).fadeIn(100).fadeOut(100).fadeIn(100);
  playSound(randomChosenColour);
}

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

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

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

  }
  else{
  playSound("wrong");
  console.log("Wrong");
  $("body").addClass("game-over");
  setTimeout(function(){
   $("body").removeClass("game-over"); 
  },200);
  $("#level-title").text("Game Over, Press Any Key to Restart");
  startOver();
}
}

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