index.js

// Detecting Button Press

var numberOfDrumButtons = document.querySelectorAll(".drum").length;

$(".drum").click(function () {
        var buttonInnerHTML = $(this).html();

        makeSound(buttonInnerHTML);
        buttonAmination(buttonInnerHTML);
        
});

// Detecting Keyboard Press

$(document).keydown(function(event){

    makeSound(event.key);
    buttonAmination(event.key);

});

function makeSound(key){
    switch (key) {
        case "w":
            var tom1 = new Audio("./sounds/tom-1.mp3");
            tom1.play();
            break;

        case "a":
            var tom2 = new Audio("./sounds/tom-2.mp3");
            tom2.play();
            break;

        case "s":
            var tom3 = new Audio("./sounds/tom-3.mp3");
            tom3.play();
            break;

        case "d":
            var tom4 = new Audio("./sounds/tom-4.mp3");
            tom4.play();
            break;

        case "j":
            var snare = new Audio("./sounds/snare.mp3");
            snare.play();
            break;

        case "k":
            var crash = new Audio("./sounds/crash.mp3");
            crash.play();
            break;

        case "l":
            var kick = new Audio("./sounds/kick-bass.mp3");
            kick.play();
            break;

        default:
            console.log(key);
            break;
    }
}

// Animation on button click or key press

function buttonAmination(currentKey){
    var activeButton = $("."+ currentKey);

    activeButton.addClass("pressed");

    setTimeout(function(){
        activeButton.removeClass("pressed");
    },100)
}