preliminary approach to getting es6 features included where available

Author: dtao

Diff for: lazy.node.js

@@ -9,6 +9,11 @@ var util   = require("util");
 // Node.js)
 var Lazy = require("./lazy.js");
 
+var isHarmonySupported = require('./util.js').isHarmonySupported;
+if (isHarmonySupported()) {
+  require('./experimental/lazy.es6.js');
+}
+
 /**
  * @constructor
  */

Diff for: spec/node_spec.js

@@ -1,7 +1,8 @@
 var fs           = require("fs"),
     path         = require("path"),
     Stream       = require("stream"),
-    MemoryStream = require("memorystream");
+    MemoryStream = require("memorystream"),
+    util         = require('../util.js');
 
 require("./lazy_spec.js");
 require("./map_spec.js");
@@ -29,27 +30,11 @@ require("./watch_spec.js");
 require("./merge_spec.js");
 require("./join_spec.js");
 
-if (isHarmonySupported()) {
+if (util.isHarmonySupported()) {
   require('../experimental/lazy.es6.js');
   require('./es6_spec.js');
 }
 
-function isHarmonySupported() {
-  var version = process.version.split('.');
-
-  // We'll only bother checking Node versions 0.10 and greater
-  if (version[0] == 'v0' && Number(version[1]) < 10) {
-    return false;
-  }
-
-  try {
-    eval('(function*() {})');
-    return true;
-  } catch (e) {
-    return false;
-  }
-}
-
 // Sequence types
 require("./string_like_sequence_spec.js");
 require("./async_sequence_spec.js");

Diff for: util.js

@@ -0,0 +1,19 @@
+function isHarmonySupported() {
+  var version = process.version.split('.');
+
+  // We'll only bother checking Node versions 0.10 and greater
+  if (version[0] == 'v0' && Number(version[1]) < 10) {
+    return false;
+  }
+
+  try {
+    eval('(function*() {})');
+    return true;
+  } catch (e) {
+    return false;
+  }
+}
+
+module.exports = {
+  isHarmonySupported: isHarmonySupported
+};