add solution: valid anagram

yihyun-kim1 · yihyun-kim1 · commit 7dbd804ff37c · 2026-03-15T14:15:39.000+09:00
diff --git a/valid-anagram/yihyun-kim1.js b/valid-anagram/yihyun-kim1.js
@@ -0,0 +1,22 @@
+/**
+ * @param {string} s
+ * @param {string} t
+ * @return {boolean}
+ */
+const isAnagram = (s, t) => {
+  if (s.length !== t.length) return false;
+
+  const map = new Map();
+
+  for (let char of s) {
+    map.set(char, (map.get(char) || 0) + 1);
+  }
+
+  for (let char of t) {
+    if (!map.has(char)) return false;
+    map.set(char, map.get(char) - 1);
+    if (map.get(char) < 0) return false;
+  }
+
+  return true;
+};
