Is defining every variable at the top always the best approach?

Question

I\'ve heard that it is a good technique to define your variables at the top of a function, so you don\'t end up with variable hoisting problems. This:

// Beginni         


        

Answer 1

This is a style question. Not a functionality question.

The javascript parser will take this code

function() {
   dostuff();
   var i = 4;
}

and turn it into :

function() {
   var i;
   dostuff();
   i = 4;
}

As for the style question. No thank you I thought we left that behind with ANSI C.

What you want to do is declare functions at the top of their "scope"

If the "scope" of a variable is the entire function then declare them at the top. If the "scope" is a subset of a function then declare them at the start of the subset.

treat "scope" as logical scope rather then function scope.

This should ensure maximum readability.