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Asked: 2026-05-28T07:17:27+00:00

Having coded JavaScript since 1996, I have a very simple issue which I could

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Having coded JavaScript since 1996, I have a very simple issue which I could not clearly prove/disprove using jsfiddle

In some JS attached to a CV I spotted some issues that I would like to verify – one of which is
multiple declaration of variable in the same function

Testing it seems it is allowed in newer browsers (OSX Chrome16 Fx 10beta) – as far as I remember it used to give errors (Netscape/Mozilla/Fx1/IE5 or so) :

function something() {
  var var1 = "";
.
/* reams of code which scrolls the first declaration off the screen 
   so the author likely forgot the var was already declared earlier 
   in the same function */
.
  var var1 = ""; // could this result in an error in some browsers?
}

My fiddle is here

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1 Answer

  1. Editorial Team

    Not as far as I’m aware, I’ve seen javascript functions with multiple for loops each declaring their own var i for at least 6 years all without issue.

    Having looked at the spec, there seems to be nothing concrete in this area, however since (particularly global) variable name overwrites (read: clashes) has been a feature since inception I would be very surprised if a restraint upon multiple declarations was imposed.

    As it stands, I would suggest that it doesn’t show particularly good knowledge of scoping (and hoisting) in javascript, but is valid code nonetheless.

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