simongame.js

var buttonColours=["red", "blue", "green", "yellow"];
var gamePattern=[];
var userClickedPattern=[];
var level =0;
var started=false;
$(document).keydown(function(){
  if(started!=true){
    $("#level-title").text("level "+level);
    nextSequence();
    started=true;
  }
});

function nextSequence(){
userClickedPattern=[];
level++;
$("#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);
}

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

function checkAnswer(currentLevel){
if(userClickedPattern[currentLevel]===gamePattern[currentLevel]){

if(userClickedPattern.length===gamePattern.length){
  setTimeout(function(){
    nextSequence();
  },1000);
}
}
else{
  playSound("wrong");
  $("body").addClass("game-over");
  setTimeout(function(){
    $("body").removeClass("game-over");
  },200);
  $("#level-title").text("Game Over, Press Any Key to Restart");
  startOver();
}
}


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