map-the-debris.js

/*
Return a new array that transforms the elements' average altitude into their 
orbital periods (in seconds).

The array will contain objects in the format {name: 'name', avgAlt: avgAlt}.
*/

function orbitalPeriod(arr) {
  var GM = 398600.4418;
  var earthRadius = 6367.4447;

  for (let i = 0; i < arr.length; i++) {
    let orbitalPeriodCalc =
      2 * Math.PI * Math.sqrt(Math.pow(earthRadius + arr[i]["avgAlt"], 3) / GM);

    delete arr[i]["avgAlt"];

    arr[i]["orbitalPeriod"] = Math.round(orbitalPeriodCalc);
  }

  return arr;
}

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