jS - indexOf on array

by Alejandro M

HTML

<p>Click the button to test.</p>
<button>Try it</button>
<p id="demo"></p>

JavaScript

function myFunction() {
  var test = cases.indexOf("caso2");
  document.getElementById("demo").innerHTML = test;
	// -1 si no encuentra
 	// x , el numero de indic, si encuentra coincidencia
}
var cases = ["caso1", "caso2", "caso3", "caso4"];
document.getElementById("demo").innerHTML = cases;
document.getElementsByTagName("button")[0].addEventListener("click", myFunction);