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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
</body>
</html>
 
var noSideEffect = "Hello World!";
function runInGlobalScope() {
  console.log(noSideEffect);
}
(function() {
  var noSideEffect = "Farewell and good night!";
  
  function runInLocalScope() {
    console.log(noSideEffect);
  }
  runInLocalScope();
  runInGlobalScope();
})();
runInGlobalScope();
Output

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