junojo · September 4, 2021 08:38 · Jun 22, 2017
diff --git a/problem.md b/problem.md
@@ -0,0 +1,19 @@
+### Find the missing letter
+
+Write a method that takes an array of consecutive (increasing) letters as input and that returns the missing letter in the array.
+
+You will always get an valid array. And it will be always exactly one letter be missing. The length of the array will always be at least 2.
+The array will always contain letters in only one case.
+
+Example:
+
+```
+['a','b','c','d','f'] -> 'e'
+['O','Q','R','S'] -> 'P'
+```
+
+(Use the English alphabet with 26 letters!)
+
+Have fun coding it and please don't forget to vote and rank this kata! :-)
+
+I have also created other katas. Take a look if you enjoyed this kata!
diff --git a/solution.js b/solution.js
@@ -0,0 +1,8 @@
+function findMissingLetter(array) {
+  var string = array.join("");
+  for (var i = 0; i < string.length; i++) {
+    if (string.charCodeAt(i + 1) - string.charCodeAt(i) != 1) {
+      return String.fromCharCode(string.charCodeAt(i) + 1);
+    }
+  }
+}
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