jQuery Exercise

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="https://code.jquery.com/jquery-3.4.1.min.js"
        integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
    <style>
        .color-box {
            height: 200px;
            width: 200px;
            display: inline-block;
            margin: 50px;
        }
        .large-color-box {
            height: 500px;
            width: 500px;
            display: inline-block;
            margin: 50px;
        }
        .red {
            background-color: red;
        }
        .blue {
            background-color: blue;
        }
        .green {
            background-color: green;
        }
    </style>
    <script>
        $(document).ready(initializeApp)
        function initializeApp() {
            $("button").click(makeStuffHappen);
        }
// EXERCISE STARTS HERE ----------------------------------------------
        function makeStuffHappen() {
            //utilize the jQuery function to select all h1 elements on the DOM (there is currently just one)
            //save the return from this into a variable named headerElem
            //utilize the jQuery function to select all input elements on the DOM (there is currently just one)
            //save the return from this into a variable named inputElem
            //utilize the jQuery function to select all elements with a class of "color-box" that do not have a class of "no-change"
            //remember, the string selector given to the jQuery function works exactly the same as a CSS selector
            //HINT: look into the ":not" pseudoclass
            //save the return from this into a variable named boxesToChange
            //console.log out your headerElem and boxesToChange variables
            //what's inside of them?
            //using your inputElem variable, retrieve the current value out of the input, and save it into a variable called currentVal
            //HINT: look into the jQuery .val method
            // using your headerElem variable, change the text content of the element to the value of the currentVal variable
            //HINT: look into the jQuery .text method
            // using your boxesToChange variable, remove the class "color-box" and the class "red" from the selected element(s), and add the class "large-color-box" and a class of "blue"
            //console log our your boxesToChange variable
            //remember that we selected this dom element by using the "color-box" class initially
            //now that we have removed the "color-box" class, does the variable still contain the same element?
        }
    </script>
</head>
<body>
    <h1>I'm the main heading! My text content will definitely stay the same forever!</h1>
    <div>
        <input type="text" value="HAXXORED!!1!">
        <button>Click me!</button>
    </div>
    <div class="color-box red"></div>
    <div class="color-box red no-change"></div>
</body>
</html>