Prototype inspect() Method

Syntax:

string.inspect([useDoubleQuotes = false]);

Return Value:

Returns a debug-oriented version of the string.

Example:

<html>
<head>
<title>Prototype examples</title>
<script type="text/javascript" 
   src="/javascript/prototype.js">
</script>
<script>

function showResult(){

  var str = 'I\'m so happy.';

  alert( "Check without inspect :" + str ); 
  alert( "First Check :" + str.inspect() );
  alert( "Second Check :" + str.inspect( true ) );

}

</script>
</head>

<body>

  <p>Click the button to see the result.</p>
  <br />
  <br />
  <input type="button" value="Result" onclick="showResult();"/>

</body>
</html>

This returns the following value in actual but it will return different values in alert dialog or the console.

Check without inspect: I'm so happy.
First Check : '\'I\\\'m so happy.\''
Second Check : '"I'm so happy."'

To understand it in better way you can Try it yourself.