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