add: DaleStudy#242 valid anagram

Author: sukyoungshin

valid-anagram/sukyoungshin.ts

@@ -0,0 +1,28 @@
+// 1번풀이 (hashTable)
+function isAnagram1(s: string, t: string): boolean {
+  if (s.length !== t.length) return false;
+
+  const charCount: Record<string, number> = {};
+
+  for (const char of s) {
+    charCount[char] = (charCount[char] ?? 0) + 1;
+  }
+
+  for (const char of t) {
+    if (!charCount[char]) return false;
+    charCount[char]--;
+  }
+
+  return true;
+};
+
+// 2번풀이 (sort)
+function isAnagram2(s: string, t: string): boolean {
+  if (s.length !== t.length) return false;
+
+  const sortedS = s.split('').sort().join('');
+  const sortedT = t.split('').sort().join('');
+
+  return sortedS === sortedT;
+};
+