chore: feedback addressed

Author: Andreas Richter

lib/backends/memcached.js

@@ -35,6 +35,8 @@
 const promisify = require('bluebird').promisify;
 const Memcached = require('memcached');
 
+const noop = () => undefined;
+
 function createClient(options) {
   if (options.client) {
     return options.client;
@@ -62,11 +64,12 @@ MemcachedBackend.prototype.get = function get(key) {
 };
 
 MemcachedBackend.prototype.set = function set(key, value, options) {
-  return this._clientSet(key, value, options.expire).then(val => val);
+  const constant = () => value;
+  return this._clientSet(key, value, options.expire).then(constant);
 };
 
 MemcachedBackend.prototype.unset = function unset(key) {
-  return this._clientDel(key).then(() => undefined);
+  return this._clientDel(key).then(noop);
 };
 
 MemcachedBackend.prototype.end = function end() {