// Instead of...
var someVariable:String = "string 3";

switch (someVariable)
{
    case "string1":
    /** code **/
    break;
    case "string2":
    /** code **/
    break;
    case "string3":
    /** code **/
    break;
    case "string4":
    /** code **/
    break;
    case "string5":
    /** code **/
    break;
}


// Do this:

_methodMapForSomeVariable = new Dictionary();
_methodMapForSomeVariable["string1"] = _doSomething;
_methodMapForSomeVariable["string2"] = _doSomethingElse;
_methodMapForSomeVariable["string3"] = _doSomething;
_methodMapForSomeVariable["string4"] = _doSomethingElse;
_methodMapForSomeVariable["string5"] = _doSomething;

_methodMapForSomeVariable[someVariable]();


private function _doSomething():void
{
    // code...
}

private function _doSomethingElse():void
{
    // code...
}