<풀이 코드>
const nationWidth = {
'korea': 220877,
'Rusia': 17098242,
'China': 9596961,
'France': 543965,
'Japan': 377915,
'England' : 242900,
}
const k_width = nationWidth['korea'];
delete nationWidth['korea'];
var key = Object.keys(nationWidth);
var value = Object.values(nationWidth);
for(var i in key){
nationWidth[key[i]] = Math.abs(value[i]-k_width);
}
const min = Math.min(...Object.values(nationWidth));
var result = key.find(x=>nationWidth[x] == min);
console.log(`${result} ${min}`);