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target of assignment must be a reference value

• 
  Ammy
  on 23/6/11
  I don't know how to fix this error - 1105: Target of assignment must be a reference value.
  Here's my code:
  
  public static function countInstances(param1:String, param2:String) : int
  {
  var _loc_3:int = -1;
  var _loc_4:int = -1;
  do
  {
  
  ++_loc_4 = param1.indexOf(param2, ++_loc_4);
  _loc_3++;
  }while (++_loc_4 != -1)
  return _loc_3;
  }

  reply
• corneliu.chitanu
  on 27/6/11

  Hello Ammy,
  
  Bassically, you can't do this:
  

                  
  var a:Number;
  ++a = 3;
  
                  

  That's what you do here:

                  
  ++_loc_4 = param1.indexOf(param2, ++_loc_4);
  
                  

  What this does is assign a value (param1.indexOf(param2, ++_loc_4)) to another value. You must know that this expression:

                  
  a++;
  //or 
  ++a;
  
                  

  increments the variable and returns a value. The ++a returns the updated value, after it's incremented and a++ returns the value before it's incremented. Anyway, you can't assign a value to another value. You must assign a value to a reference, which would be a variable name. Your algorithm is not good anyway. This is what you need:

                  
  var str : String = "A String in another String";
  
  trace(str.split('String').length - 1); //this counts the number of appearances of the 'String' in the str string
  
  trace(str.split(new RegExp("IN", "gi")).length-1); //this counts the number of appearances of the "IN" string in the str string, but it will be case insensitive
  
                  

  
  
  Last edit: on 27/6/11

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