Freecodecamp's Advanced Algorithm Scripting Challenge

'Map the Debris' using forEach()

function orbitalPeriod(arr) {
  var GM = 398600.4418;
  var earthRadius = 6367.4447;
  
  arr.forEach(function(obj){
    var orbPeriod = Math.round(2*Math.PI*Math.sqrt(Math.pow(earthRadius + obj.avgAlt, 3)/GM));
    obj.orbitalPeriod = orbPeriod;
    delete obj.avgAlt;
  });
  
  return arr;
}

orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}]);

'Map the Debris' using reduce()

function orbitalPeriod(arr) {
  var GM = 398600.4418;
  var earthRadius = 6367.4447;
  return arr.reduce(function(acc, obj){
    var orbPeriod = Math.round(2*Math.PI*Math.sqrt(Math.pow(earthRadius + obj.avgAlt, 3)/GM));
    acc.push({name: obj.name, orbitalPeriod: orbPeriod});
    return acc;
  }, []);
}

orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}]);