implement removeData method

src/attributes.js

@@ -130,3 +130,29 @@ fn.data = function(key, value) {
 
     return this;
 };
+
+fn.removeData = function(key) {
+    var i = 0,
+        length = this.length,
+        jdata, dataset;
+
+    for (; i < length; i++) {
+        jdata = this[i].jdata;
+        dataset = this[i].dataset;
+
+        if (key) {
+            jdata && jdata[key] && delete jdata[key];
+            delete dataset[key];
+        } else {
+            for (key in jdata) {
+                delete jdata[key];
+            }
+
+            for (key in dataset) {
+                delete dataset[key];
+            }
+        }
+    }
+
+    return this;
+};

test/attributes.js

@@ -115,4 +115,36 @@ describe('jBone Attributes', function() {
         expect(a.data('third')).be.eql(obj);
     });
 
+    it('removeData(key)', function() {
+        var a = jBone('<div>');
+
+        a.data('name', 'John');
+        a.data('fn', function() {});
+        expect(a.data('name')).be.eql('John');
+
+        a
+            .removeData('name')
+            .removeData('fn');
+        expect(a.data('name')).be.eql(undefined);
+        expect(a.data('fn')).be.eql(undefined);
+    });
+
+    it('removeData()', function() {
+        var a = jBone('<div>');
+
+        a.data('name', 'John');
+        a.data('fn', function() {});
+        expect(a.data('name')).be.eql('John');
+
+        a.removeData();
+        expect(a.data('name')).be.eql(undefined);
+        expect(a.data('fn')).be.eql(undefined);
+    });
+
+    it('removeData(key) and removeData() witn not defined keys', function() {
+        var a = jBone('<div>');
+        a.removeData('name');
+        a.removeData();
+    });
+
 });