Merge pull request #145 from front-studium/sgoldenbird

`week34` 풀었습니다.

Author: sgoldenbird

sgoldenbird/level0/flag에_따라_다른_값_반환하기.js

@@ -0,0 +1,3 @@
+function solution(a, b, flag) {
+  return flag === true ? a + b : a - b;
+}

sgoldenbird/level0/n개_간격의_원소들.js

@@ -0,0 +1,7 @@
+function solution(num_list, n) {
+  let answer = [];
+  for (let i = 0; i < num_list.length; i += n) {
+    answer.push(num_list[i]);
+  }
+  return answer;
+}

sgoldenbird/level1/정수_내림차순으로_배치하기.js

@@ -0,0 +1,8 @@
+function solution(n) {
+  const sorted = String(n)
+    .split("")
+    .sort((a, b) => b - a)
+    .join("");
+
+  return Number(sorted);
+}