'I'm trying to make a test html where pressing a button moves along the index of an array which starts at 0

When I test this code it only shows 0, despite the button function running. What have I done wrong? Since I'm only starting out with JavaScript I'd appreciate an in-depth answer.

var y = 1;
myFunction();

function myFunc() {
  var z = 1
  var x = y + z;
  y = x
  alert("f");
}

function myFunction() {
  y = 0;
  alert("sdrz");
}
const numbers = ["0", "1", "2", "3"];
document.getElementById("demo").innerHTML = numbers[y];
<p id="demo"></p>

<button onclick="myFunc()">+1</button>
javascripthtmlarraysvariables


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