Try it Yourself - JavaScript global

<!DOCTYPE html>
<html>
<body>

<p>The global JavaScript function parseInt() converts strings to numbers:</p>

<p id="demo"></p>

<script>
document.getElementById("demo").innerHTML =
   parseInt("10") + "<br>" +
   parseInt("10.33") + "<br>" +
   parseInt("10 6") + "<br>" +
   parseInt("10 years") + "<br>" +
   parseInt("years 10");
</script>

</body>
</html>