TheNorthEestern

  this.bindDynamicFunction = function(o, property, value){
    var _value = value;
    var _funcName = (property.charAt(0).toUpperCase() + property.slice(1));
    o["get" + _funcName] = function(){
      return _value;
    };
    o["set" + _funcName] = function(v){
      _value = v;
    };
  };

TheNorthEestern

tell application "iTerm"
  if the transparency of the current session of the current terminal > 0 then
    set the transparency of the current session of the current terminal to 0
  else
    set the transparency of the current session of the current terminal to 0.2
  end if
end tell