challenge2

 /* a) modelling our solar system */

function convertDistance(planet) {
  var kmDistance = planet.distance * 150000000;
  return kmDistance + ' km.';
}

function convertMass(planet) {
  var kgMass = planet.mass * 5.97;
  return kgMass + '  10^24 kg.';
}

 var solarSystem = {
   distanceCtrGalaxy: 28000
   age: 5000000000
   
   planets: [{
     name: 'Mercury',
     mass: 0.055,
     distance: 3.4,
     satelites: [],
     terrestrial: true,
     giant: false,
     gasGiant: false
   }, {
     name: 'Venus',
     mass: 0.81,
     distance: 0.7,
     satelites: [],
     terrestrial: true,
     giant: false,
     gasGiant: false
   }, {
     name: 'Earth',
     mass: 1,
     distance: 1,
     satelites: ['Moon'],
     terrestrial: true,
     giant: false,
     gasGiant: false
   }, {
     name: 'Mars',
     mass: 0.107,
     distance: 1.5,
     satelites: ['Phobos', 'Deimos'],
     terrestrial: true,
     giant: false,
     gasGiant: false
   }, {
     name: 'Jupiter',
     mass: 318,
     distance: 5.2,
     satelites: ['Io', 'Europa', 'Ganymede', 'Callisto'],
     terrestrial: false,
     giant: true,
     gasGiant: true
   }, {
     name: 'Saturn',
     mass: 95,
     distance: 9.5,
     satelites: ['Mimas',
       'Enceladus',
       'Tethys',
       'Dionne',
       'Rhea',
       'Titan',
       'Hyperion',
       'Iapetus',
       'Phoebe'
     ],
     terrestrial: false,
     giant: true,
     gasGiant: true
   }, {
     name: 'Uranus',
     mass: 14,
     distance: 19.2,
     satelites: ['Puck', 'Miranda', 'Ariel', 'Umbriel', 'Titania', 'Oberon'],
     terrestrial: false,
     giant: true,
     gasGiant: false
   }, {
     name: 'Neptune',
     mass: 17,
     distance: 30.1,
     satelites: ['Proteus', 'Triton', 'Neroid'],
     terrestrial: false,
     giant: true,
     gasGiant: false
   }]
   comets: 3295
 }



/* b) function which takes two inputs and spits out their range */

var arr = [];
function range(start, end){
	if(start === end){
		return arr;
	}else if (start > end) {
	  return arr;
	} else {
	arr.push(start);
	console.log(arr);
	}
	return range(start + 1, end);
}

/* c) given an array of objects holding name objects with first, 
middle, last name key-values, return the longest name in the array */

function fullName(obj) {
var name = '';
	for (var key in obj['name']){
		name += obj['name'][key] + ' ';
	}
	return name.slice(0, -1);
}

function longestName(array) {
var longest = '';
	for(var i = 0; i < array.length; i++){
	  console.log(fullName(array[i]));
	  if (fullName(array[i]).length > longest.length){
		longest = fullName(array[i]);
	  }
	}
  return longest;
}