[HAI] isIsomorphic etalon solution

lib/isIsomorphic/isIsomorphic.ts

@@ -1,16 +1,36 @@
+// export function isIsomorphic(s: string, t: string): boolean {
+//   let ht: Record<string, string> = {};
+//   let ht2: Record<string, string> = {};
+//   if (s.length !== t.length) return false;
+
+//   for (let [index, key] of Object.entries(s)) {
+//     const currentValue = t[index];
+//     if (key in ht && currentValue !== ht[key]) return false;
+//     if (currentValue in ht2 && key !== ht2[currentValue]) return false;
+
+//     ht[key] = currentValue;
+//     ht2[currentValue] = key;
+//   }
+
+//   return true;
+// }
+
+// etalon
 export function isIsomorphic(s: string, t: string): boolean {
-  let ht: Record<string, string> = {};
-  let ht2: Record<string, string> = {};
-  if (s.length !== t.length) return false;
+  let sMap = {};
+  let tMap = {};
 
-  for (let [index, key] of Object.entries(s)) {
-    const currentValue = t[index];
-    if (key in ht && currentValue !== ht[key]) return false;
-    if (currentValue in ht2 && key !== ht2[currentValue]) return false;
+  for (let i = 0; i < s.length; i++) {
+    if (sMap[s[i]] && sMap[s[i]] !== t[i]) {
+      return false;
+    }
 
-    ht[key] = currentValue;
-    ht2[currentValue] = key;
+    if (tMap[t[i]] && tMap[t[i]] !== s[i]) {
+      return false;
     }
 
+    sMap[s[i]] = t[i];
+    tMap[t[i]] = s[i];
+  }
   return true;
 }