Question

Is it bad to use local variable in the code below and if so, why?

var lib = new function () {

    var localVariable;

    this.publicCall = function (e) {
      localVariable = e.variable;
    };

    var privateCall = function (e) {
      localVariable = e.variable; 
    };
};

Answer 1

No, in fact I’d say that looks like good practice.

What alternative were you thinking of? A global variable? Now that would be bad practice.