02-basic-challenges-2/05-find-missing-letter/find-missing-letter.js

Author: Misgana-design

02-basic-challenges-2/05-find-missing-letter/find-missing-letter-run.js

@@ -1,5 +1,5 @@
-const findMissingLetter = require('./find-missing-letter');
+const findMissingLetter = require("./find-missing-letter");
 
-result = findMissingLetter(['a', 'b', 'c', 'd', 'f', 'g']);
+result = findMissingLetter(["x", "z"]);
 
 console.log(result);

02-basic-challenges-2/05-find-missing-letter/find-missing-letter.js

@@ -1,3 +1,29 @@
-function findMissingLetter() {}
+// Solution 1
+
+// function findMissingLetter(arr) {
+//   let start = arr[0].charCodeAt(0);
+//   for (let i = 1; i < arr.length; i++) {
+//     let current = arr[i].charCodeAt(0);
+//     if (current - start > 1) {
+//       return String.fromCharCode(start + 1);
+//     }
+//     start = current;
+//   }
+//   return "";
+// }
+
+//Solution 2
+
+function findMissingLetter(arr) {
+  let alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+  let startIndex = alphabet.indexOf(arr[0]);
+
+  for (let i = 0; i < arr.length; i++) {
+    if (arr[i] !== alphabet[startIndex + i]) {
+      return alphabet[startIndex + i];
+    }
+  }
+  return "";
+}
 
 module.exports = findMissingLetter;