Map the Debris(freecodecamp高级算法8)

function orbitalPeriod(arr) {
                    var GM = 398600.4418;
                    var earthRadius = 6367.4447;var retArr = [];
                    
                    function calOrbital(avgAlt){
                        return Math.round(2 * Math.PI * (Math.sqrt(Math.pow(avgAlt + earthRadius,3)/GM)));
                        //return Math.round(Math.pow(((4*(Math.pow(Math.PI, 2)) * Math.pow((avgAlt+earthRadius), 3))/GM), 0.5));
                    }
                    
                    for(var i=0;i<arr.length;i++){
                    
                        var obj = {};
                        obj.name = arr[i].name;
                        obj.orbitalPeriod = calOrbital(arr[i].avgAlt);
                        
                        retArr.push(obj);
                    }
                    return retArr;
                }
                
                orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}]);