Test results

The code with function properties

    
   <script type="text/javascript">
    
            var ninja = {
                
                        attack:function(steps) {
                        
                            // any history array
                            if (ninja.attack.history == undefined) {
                                // create one
                                ninja.attack.history = new Array();
                            }
                            
                            // save steps
                            ninja.attack.history.push(steps);
                        
                            // return object
                            var result = { 'type': 'katana', 'points': 0 };
                           
                            // any step?
                            if (steps != undefined) {
                                
                                // calculate damage
                                var dmg = Math.floor( Math.random() * 10 * steps );
                                
                                // save and return
                               result.points = dmg;
                               return result;
                                
                            } else {
                            
                                // no step taken    
                                result.points = 1;
                                return result;
                            
                            }
                            
                        }
        };
        
        /* test 1; no history? */
        assert( ninja.attack.history==undefined , "ninja.attack.history is not defined" );
       
        /* test 2; call attack 3 times and then get history */
        ninja.attack(2);
        ninja.attack(1);
        ninja.attack(3);
       
        assert( ninja.attack.history.length>0 , "ninja.attack.history has saved items (history contents: "+ninja.attack.history.toString()+")" )
        
   </script>