010 Typing Tester Final source Code

<html>

<head>
    <title>JavaScript</title>
</head>

<body>
    <div class="message"></div>
    <textarea name="words" cols="75" rows="5" disabled></textarea>
    <br>
    <button type="button">Start</button>
    <script>
        const wording = ["Do you like JavaScript as much as I do?", "Hope you are having fun this is a simple game you can make.", "Source code is included so you can create your own version of this challenge."];
        let startTime, endTime;
        const message = document.querySelector(".message");
        const playText = document.querySelector("textarea");
        const button = document.querySelector("button");
        button.addEventListener("click", function () {
            if (this.innerText == "Start") {
                playText.disabled = false;
                playGame();
            }
            else if (this.innerText == "Done") {
                playText.disabled = true;
                button.innerText = "Start";
                endPlay();
            }
        })

        function endPlay() {
            let date = new Date();
            endTime = date.getTime();
            let totalTime = ((endTime - startTime) / 1000);
            let str = playText.value;
            let wordCount = wordCounter(str);
            let speed = Math.round((wordCount / totalTime) * 60);
            let finalMessage = "You typed at " + speed + " words per minute.";
            finalMessage += "<br>" + compareWords(message.innerText, str);
            message.innerHTML = finalMessage;
        }

        function wordCounter(strWords) {
            let response = strWords.split(" ").length;
            return response;
        }

        function compareWords(str1, str2) {
            let words1 = str1.split(" ");
            let words2 = str2.split(" ");
            let cnt = 0;
            words1.forEach(function (item, index) {
                if (item == words2[index]) {
                    cnt++;
                }
            })
            return (cnt + " correct out of " + words1.length + " words");
        }

        function playGame() {
            let randomNum = Math.floor(Math.random() * wording.length);
            message.innerText = wording[randomNum];
            let date = new Date();
            startTime = date.getTime();
            button.innerText = "Done";
        }
    </script>
</body>

</html>