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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  <script>window.log = console.log.bind(console);</script>
</body>
</html>
 
var person = {
  firstName : 'Boaz',
  lastName : 'Sender'
};
var prop = 'lastName';
log( 'Last name: ' + person[ prop ] );
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