solve valid anagram

Author: delight010

valid-anagram/delight010.swift

@@ -0,0 +1,14 @@
+class Solution {
+    func isAnagram(_ s: String, _ t: String) -> Bool {
+        var sDictionary: [Character: Int] = [:]
+        var tDictionary: [Character: Int] = [:]
+        for char in s {
+            sDictionary[char] = (sDictionary[char] ?? 0) + 1
+        }
+        for char in t {
+            tDictionary[char] = (tDictionary[char] ?? 0) + 1
+        }
+        return sDictionary == tDictionary
+    }
+}
+