https://programmers.co.kr/learn/courses/30/lessons/12901
Date 쓸줄알면 너무 쉬운 문제~
function solution(a, b) {
var day = ['SUN','MON','TUE','WED','THU','FRI','SAT'];
var date = new Date('2016-' + a + '-' + b);
return day[date.getDay()];
}
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