added utils.objectValues()

@@ -608,9 +608,7 @@ Casper.prototype.evaluate = function evaluate(fn, context) {
     } else if (arguments.length === 2) {
         // check for closure signature if it matches context
         if (utils.isObject(context) && eval(fn).length === Object.keys(context).length) {
-            context = Object.keys(context).map(function(arg) {
-                return context[arg];
-            });
+            context = utils.objectValues(context);
         } else {
             context = [context];
         }
@@ -619,9 +617,7 @@ Casper.prototype.evaluate = function evaluate(fn, context) {
         context = [].slice.call(arguments).slice(1);
     } else {
         // old casperjs method signature
-        context = Object.keys(context).map(function(arg) {
-            return context[arg];
-        });
+        context = utils.objectValues(context);
     }
     return this.page.evaluate.apply(this.page, [fn].concat(context));
 };

@@ -480,6 +480,19 @@ function node(name, attributes) {
 exports.node = node;
 
 /**
+ * Maps an object to an array made from its values.
+ *
+ * @param  Object  obj
+ * @return Array
+ */
+function objectValues(obj) {
+    return Object.keys(obj).map(function(arg) {
+        return obj[arg];
+    });
+}
+exports.objectValues = objectValues;
+
+/**
  * Serializes a value using JSON.
  *
  * @param  Mixed  value

@@ -255,6 +255,12 @@ t.comment('mergeObjects()');
     });
 })();
 
+t.comment('objectValues()');
+(function() {
+    t.assertEquals(utils.objectValues({}), [], 'objectValues() can extract object values');
+    t.assertEquals(utils.objectValues({a: 1, b: 2}), [1, 2], 'objectValues() can extract object values');
+})();
+
 t.comment('unique()');
 (function() {
     var testCases = [