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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  
</body>
</html>
 
var old;
function compare(_, a){
  if (old) console.log('equal ?', old==a);
  else old = a;
}
for (var i=0; i<2; i++){
  compare(i, function(i) { return i*i }); 
}
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anonymouspro
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