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for (var i = 0; i < some_array.length; i++) {
  // Declaring this in the loop creates a one variable for
...
  });
}
// All closures now point at the last element.

for (var i = 0; i < some_array.length; i++) {
  // Declaring this in the loop creates a one variable for
...
    return x;
  });
} // now works as expected