Return a new array that transforms the element's average altitude into their orbital periods.

bonfire-map-the-debris(Upper Intermediate Algorithm).js

// Bonfire: Map the Debris(Upper Intermediate Algorithm)
// Author: @serhiilihus
// http://www.freecodecamp.com/challenges/bonfire-map-the-debris#?solution=function%20orbitalPeriod(arr)%20%7B%0A%20%20var%20GM%20%3D%20398600.4418%3B%0A%20%20var%20earthRadius%20%3D%206367.4447%3B%0A%20%20var%20newArr%20%3D%20%5B%5D%2C%20period%3B%0A%20%20arr.forEach(function(value)%7B%0A%20%20%20period%20%3D%20Math.round(2*Math.PI*Math.sqrt(Math.pow(value.avgAlt%20%2B%20earthRadius%2C3)%2FGM))%3B%0A%20%20%20newArr.push(%7Bname%20%3A%20value.name%2C%20orbitalPeriod%20%3A%20period%7D)%3B%0A%20%20%7D)%3B%0A%20%20return%20newArr%3B%0A%7D%0A%0AorbitalPeriod(%5B%7Bname%20%3A%20%22sputnik%22%2C%20avgAlt%20%3A%2035873.5553%7D%5D)%3B%0A
// Learn to Code at Free Code Camp (www.freecodecamp.com)

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