JavaScript Callbacks

Do an addition then display the result:
5 + 5 =

here is the code:

<h2>JavaScript Callbacks</h2>


<p>Do an addition then display the result: <br> 5 + 5 = </p>

<p id="demo"></p>
<button type="button" onClick='myCalculator(5, 5, myCallback_Disp)'> Try it </button>


<script>
    
function myCallback_Disp(some_place_holder) {
  document.getElementById("demo").innerHTML = some_place_holder;
}

function myCalculator(dec_num1, dec_num2, callback_func_placeholder) {
  let dec_sum = dec_num1 + dec_num2;
  callback_func_placeholder(dec_sum);
}

//myCalculator(5, 5, myCallback_Disp);


</script>