License Key Formatting

Author: lessfish

Algorithms/License Key Formatting/license-key-formatting.js

@@ -0,0 +1,29 @@
+// Source : https://leetcode.com/problems/license-key-formatting/
+// Author : Han Zichi
+// Date   : 2017-01-11
+// Runtime: 86 ms
+
+// Your runtime beats 100.00% of javascript submissions
+
+/**
+ * @param {string} S
+ * @param {number} K
+ * @return {string}
+ */
+var licenseKeyFormatting = function(S, K) {
+  S = S.toUpperCase().replace(/-/g, '');
+
+  let ans = [];
+  let index = 0;
+
+  if (S.length % K) {
+    let str = S.substr(0, S.length % K);
+    ans.push(str);
+    index = S.length % K;
+  }
+
+  for (let i = index, len = S.length; i < len; i += K)
+    ans.push(S.substr(i, K));
+
+  return ans.join('-');
+};