Updating exercises

src/exercises/271.encode-and-decode-strings.js

@@ -0,0 +1,31 @@
+// @leet start
+/**
+ * Encodes a list of strings to a single string.
+ *
+ * @param {string[]} strs
+ * @return {string}
+ */
+var key = '$#@C$(){(($[]%^[$()${#${(}'
+var encode = function(strs) {
+    if (strs.length === 0) return [];
+    const encoded = strs.join(key);
+    return encoded;
+};
+
+/**
+ * Decodes a single string to a list of strings.
+ *
+ * @param {string} s
+ * @return {string[]}
+ */
+var decode = function(str) {
+    if (Array.isArray(str)) return str;
+    let decoded = str.split(key);
+    return decoded;
+};
+
+/**
+ * Your functions will be called as such:
+ * decode(encode(strs));
+ */
+// @leet end