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<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Numbers</h1>
<h2>The parseInt() Method</h2>
<p>Number.parseInt() converts strings to whole numbers:</p>
<p id="demo"></p>
<script>
document.getElementById("demo").innerHTML = 
  Number.parseInt("-10") + "<br>" +
  Number.parseInt("-10.33") + "<br>" +
  Number.parseInt("10") + "<br>" +
  Number.parseInt("10.33") + "<br>" +
  Number.parseInt("10 6") + "<br>" +  
  Number.parseInt("10 years") + "<br>" +  
  Number.parseInt("years 10");  
</script>
</body>
</html>