Create 848-shifting-letters.js

Author: everthis

848-shifting-letters.js

@@ -0,0 +1,15 @@
+/**
+ * @param {string} S
+ * @param {number[]} shifts
+ * @return {string}
+ */
+const shiftingLetters = function(S, shifts) {
+  let suffixSum = 0,
+    result = "";
+  for (let i = S.length - 1; i >= 0; i--) {
+    suffixSum += shifts[i];
+    let ascii = S[i].charCodeAt() - 97;
+    result = String.fromCharCode(97 + ((ascii + suffixSum) % 26)) + result;
+  }
+  return result;
+};