create stream from object/dictionary

kemsky · Nov 18, 2015 · b949c55 · b949c55
1 parent c407d19
commit b949c55
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diff --git a/source/com/kemsky/Stream.as b/source/com/kemsky/Stream.as
@@ -2192,5 +2192,57 @@ package com.kemsky
 
             return callback == null ? result : result.map(callback);
         }
+
+        /**
+         * Create stream from object(dictionary) property names.
+         * @param object object used as source for a stream
+         * @return created Stream object
+         * @example
+         * <pre>
+         *     var obj:Object = {name1: "first", name2: "second"};
+         *     var s:Stream = Stream.fromKeys(obj);
+         *     trace(s);
+         *     //prints ["name1", "name2"]
+         * </pre>
+         * @internal immutable
+         */
+        public static function fromKeys(object:Object):Stream
+        {
+            var result:Stream = new Stream();
+            for (var prop:String in object)
+            {
+                if(object.hasOwnProperty(prop))
+                {
+                    result.push(prop);
+                }
+            }
+            return result;
+        }
+
+        /**
+         * Create stream from object(dictionary) property values.
+         * @param object object used as source for a stream
+         * @return created Stream object
+         * @example
+         * <pre>
+         *     var obj:Object = {name1: "first", name2: "second"};
+         *     var s:Stream = Stream.fromValues(obj);
+         *     trace(s);
+         *     //prints ["first", "second"]
+         * </pre>
+         * @internal immutable
+         */
+        public static function fromValues(object:Object):Stream
+        {
+            var result:Stream = new Stream();
+            for (var prop:String in object)
+            {
+                if(object.hasOwnProperty(prop))
+                {
+                    result.push(object[prop]);
+                }
+            }
+            return result;
+        }
     }
 }
diff --git a/testSrc/com/kemsky/TestStream.as b/testSrc/com/kemsky/TestStream.as
@@ -22,6 +22,33 @@ package com.kemsky
         {
         }
 
+        [Test]
+        public function testFromValues():void
+        {
+            var obj:Object = {name1: "first", name2: "second"};
+
+            var s:Stream = Stream.fromValues(obj).sort();
+            assertEquals(s.length, 2);
+            assertEquals(s.first, "first");
+            assertEquals(s.second, "second");
+
+            var s2:Stream = Stream.fromKeys(null);
+            assertEquals(s2.length, 0);
+        }
+
+        [Test]
+        public function testFromKeys():void
+        {
+            var obj:Object = {name1: "first", name2: "second"};
+
+            var s:Stream = Stream.fromKeys(obj).sort();
+            assertEquals(s.length, 2);
+            assertEquals(s.first, "name1");
+            assertEquals(s.second, "name2");
+
+            var s2:Stream = Stream.fromKeys(null);
+            assertEquals(s2.length, 0);
+        }
 
         [Test]
         public function testDeduplicate():void