[Map The Debris] 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}. The values should be rounded to the nearest whole number. The body being orbited is Earth. The radius of the earth is 6367.4447 kilometers, and th…

mapthedebris.js

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

  for (let i = 0; i < arr.length; i++) {
    const height = Math.round(arr[i].avgAlt);
	const r = Math.round(earthRadius + height);
	const r3 = Math.round(Math.pow(r, 3));
	const pi = 2 * Math.PI;
	const T = Math.round(pi * Math.sqrt(r3 / GM));
	delete arr[i].avgAlt;
    arr[i].orbitalPeriod = T;
  }
  return arr;
}

console.log(orbitalPeriod([{name: "iss", avgAlt: 413.6}, {name: "hubble", avgAlt: 556.7}, {name: "moon", avgAlt: 378632.553}]));
// returns 
// [ { name: 'iss', orbitalPeriod: 5557 },
//   { name: 'hubble', orbitalPeriod: 5734 },
//   { name: 'moon', orbitalPeriod: 2377399 } ]