Create 859-buddy-strings.js

Author: everthis

859-buddy-strings.js

@@ -0,0 +1,29 @@
+/**
+ * @param {string} A
+ * @param {string} B
+ * @return {boolean}
+ */
+const buddyStrings = function(A, B) {
+    if(A.length !== B.length) return false
+    const aCode = ('a').charCodeAt(0)
+    if(A === B) {
+       const count = new Array(26).fill(0)
+       for(let i = 0; i < A.length; i++) {
+         count[A.charCodeAt(i) - aCode]++
+       }
+       for(let el of count) {
+         if(el > 1) return true
+       }
+       return false
+    } else {
+      const arr = []
+      for(let i = 0; i < A.length; i++) {
+        if(A[i] !== B[i]) {
+           arr.push(i)
+           if(arr.length > 2) return false
+        }
+      }
+      if(arr.length !== 2) return false
+      return A[arr[0]] === B[arr[1]] && A[arr[1]] === B[arr[0]]
+    }
+};