Create 535-encode-and-decode-tinyurl.js

Solved encode-decode-tinyurl in JS.

javascript/535-encode-and-decode-tinyurl.js

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+// problem link https://leetcode.com/problems/encode-and-decode-tinyurl
+// time complexity O(1)
+
+
+const encodeMap = new Map();
+const decodeMap = new Map();
+const base = 'http://tinyurl.com/';
+
+var encode = function(longUrl) {
+ let shortUrl = ''
+ if(!encodeMap.has(longUrl)) {
+ shortUrl = (base + encodeMap.size + 1).toString();
+ encodeMap.set(longUrl, shortUrl);
+ decodeMap.set(shortUrl, longUrl);
+ } else {
+ return encodeMap.has(longUrl);
+ }
+
+ return shortUrl;
+};
+
+var decode = function(shortUrl) {
+ return decodeMap.get(shortUrl);
+};