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Other than style, is there an advantage to either of them over just declaring each one separately?

  var variable;
  var anotherVariable;
  var thirdVariable;
One issue I see with multiple variable declarations is that a forgotten comma doesn't cause a syntax error, it just causes that variable and any after it to be global variables. Which leads to much nastier javascript bugs.



For Node code, not really. For browser code, usually not really, but for high traffic sites or widely used libraries every character counts.

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