Helpers: Fix array check not working for components loaded by setSour…

…ce()

When the array comes from another JS context, as is the case when
using eval() in ComponentLoader.setSource() isinstance Array returns
false even if it is a proper array.

src/lib/Helpers.coffee

@@ -6,6 +6,10 @@ StreamSender = require('./Streams').StreamSender
 StreamReceiver = require('./Streams').StreamReceiver
 InternalSocket = require './InternalSocket'
 
+isArray = (obj) ->
+  return Array.isArray(obj) if Array.isArray
+  return Object.prototype.toString.call(arg) == '[object Array]'
+
 # MapComponent maps a single inport to a single outport, forwarding all
 # groups from in to out and calling `func` on each incoming packet
 exports.MapComponent = (component, func, config) ->
@@ -74,10 +78,10 @@ exports.MapComponent = (component, func, config) ->
 exports.WirePattern = (component, config, proc) ->
   # In ports
   inPorts = if 'in' of config then config.in else 'in'
-  inPorts = [ inPorts ] unless inPorts instanceof Array
+  inPorts = [ inPorts ] unless isArray inPorts
   # Out ports
   outPorts = if 'out' of config then config.out else 'out'
-  outPorts = [ outPorts ] unless outPorts instanceof Array
+  outPorts = [ outPorts ] unless isArray outPorts
   # Error port
   config.error = 'error' unless 'error' of config
   # For async process