week45 풀었습니다.

sgoldenbird/level0/문자열_바꿔서_찾기.js

@@ -0,0 +1,8 @@
+function solution(myString, pat) {
+  let switchedString = "";
+  for (let char of myString) {
+    switchedString += char === "A" ? "B" : "A";
+  }
+
+  return switchedString.includes(pat) ? 1 : 0;
+}

sgoldenbird/level0/숫자_찾기.js

@@ -0,0 +1,6 @@
+function solution(num, k) {
+  const stringNum = String(num);
+  const stringK = String(k);
+
+  return stringNum.indexOf(stringK) + 1 || -1;
+}

sgoldenbird/level1/핸드폰_번호_가리기.js

@@ -0,0 +1,6 @@
+function solution(phone_number) {
+  const hidden = "*".repeat(phone_number.length - 4);
+  const last = phone_number.slice(-4);
+
+  return hidden + last;
+}