refactor: using indexOf instead of a loop

Author: 2kjiejie

lib/portfinder.js

@@ -126,19 +126,9 @@ exports.getPort = function (options, callback) {
   }
 
   if (options.host) {
-
-    var hasUserGivenHost;
-    for (var i = 0; i < exports._defaultHosts.length; i++) {
-      if (exports._defaultHosts[i] === options.host) {
-        hasUserGivenHost = true;
-        break;
-      }
+    if (exports._defaultHosts.indexOf(options.host) !== -1) {
+      exports._defaultHosts.push(options.host)
     }
-
-    if (!hasUserGivenHost) {
-      exports._defaultHosts.push(options.host);
-    }
-
   }
 
   var openPorts = [], currentHost;