JavaScript string slice

<html>
  <head> 
    <title> javascript string slice nagative </title>
  </head>
  <body>
    <h1> javascript string slice nagative index</h1>
    <p id='demo'></p>
    
    <script>
     var str = 'John the Don'
     var substr = str.slice(-7); // 'the Don'
     //startIndex = str.length + index(negative)
      
      document.getElementById('demo').innerHTML = substr;
    </script>
    
  </body>

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