Make host parameter optional

README.md

@@ -39,6 +39,11 @@ portscanner.findAPortNotInUse(3000, 3010, '127.0.0.1', function(error, port) {
 portscanner.findAPortInUse(3000, 3010, '127.0.0.1', function(error, port) {
   console.log('PORT IN USE AT: ' + port)
 })
+
+// And skip host param. Default is '127.0.0.1'
+portscanner.findAPortNotInUse(3000, 4000, function(error, port) {
+  console.log('PORT IN USE AT: ' + port)
+})
 ```
 
 The example directory contains a more detailed example.

lib/portscanner.js

@@ -80,22 +80,27 @@ portscanner.findAPortNotInUse = function(portList, host, callback) {
  * Checks the status of an individual port.
  *
  * @param {Number} port           - Port to check status on.
- * @param {String|Object} options - host or options
+ * @param {String|Object|Function} arg2    - host or options or function
  *   - {String} host              - Host of where to scan. Defaults to '127.0.0.1'.
  *   - {Object} options
  *     - {String} host            - Host of where to scan. Defaults to '127.0.0.1'.
  *     - {Number} timeout         - Connection timeout. Defaults to 400ms.
- * @param {Function} callback     - function (error, port) { ... }
+ * @param {Function} arg3     - function (error, port) { ... }
  *   - {Object|null} error        - Any errors that occurred while port scanning.
  *   - {String} status            - 'open' if the port is in use.
  *                                  'closed' if the port is available.
  */
-portscanner.checkPortStatus = function(port, options, callback) {
-  if (typeof options === 'string') {
+portscanner.checkPortStatus = function(port, arg2, arg3) {
+  var options = {}
+    , callback
+
+  if (typeof arg2 === 'string') {
     // Assume this param is the host option
-    options = {host: options}
+    options = {host: arg2}
   }
 
+  callback =  Array.prototype.slice.call(arguments).slice(-1)[0];
+
   var host = options.host || '127.0.0.1'
   var timeout = options.timeout || 400
   var connectionRefused = false;
@@ -183,7 +188,27 @@ function findAPortWithStatus(status, startPort, endPort, host, callback) {
   })
 }
 
-function findAPortWithStatus(status, portList, host, callback) {
+function findAPortWithStatus(status, params) {
+  var host;
+  var callback;
+
+  //use array of ports
+  if (typeof params[0] === 'object') {
+    var ports = params[0];
+    host = typeof params[1] === 'string' ? params[1] : null;
+
+  //use startPort and endPort
+  } else if (typeof params[0] === 'number') {
+    var startPort = params[0];
+    var endPort = params[1];
+    host = typeof params[2] === 'string' ? params[2] : null;
+  }
+
+  //callback always at the end
+  callback = Array.prototype.slice.call(params).slice(-1)[0];
+
+  endPort = endPort || 65535
+
   var foundPort = false
   var portIndex = 0
   var port = portList[portIndex]