trim and empty

source/com/kemsky/filters/empty.as

@@ -0,0 +1,19 @@
+/*
+ *  Copyright: (c) 2016. Turtsevich Alexander
+ *
+ *  Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.html
+ */
+
+package com.kemsky.filters
+{
+    import com.kemsky.support.toValue;
+
+    public function empty(val:*):Function
+    {
+        return function (item:*):Boolean
+        {
+            var value:* = toValue(item, val);
+            return (value as String) == null || (value as String).length == 0;
+        };
+    }
+}

source/com/kemsky/filters/trim.as

@@ -0,0 +1,25 @@
+/*
+ *  Copyright: (c) 2016. Turtsevich Alexander
+ *
+ *  Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.html
+ */
+
+package com.kemsky.filters
+{
+    import com.kemsky.support.toValue;
+
+    import mx.utils.StringUtil;
+
+    public function trim(val:*):Function
+    {
+        return function (item:*):String
+        {
+            var value:* = toValue(item, val);
+            if(value is String)
+            {
+                return StringUtil.trim(value);
+            }
+            return "";
+        };
+    }
+}

testSrc/com/kemsky/filters/TestFilters.as

@@ -17,6 +17,27 @@ package com.kemsky.filters
         {
         }
 
+        [Test]
+        public function testTrim():void
+        {
+            var s:Stream = $("", null, "    ", "test  ");
+            var e:Stream = s.map(trim(_));
+            assertEquals(e.length, 4);
+            assertEquals(e.first, "");
+            assertEquals(e.second, "");
+            assertEquals(e.third, "");
+            assertEquals(e.fourth, "test");
+        }
+
+        [Test]
+        public function testEmpty():void
+        {
+            var s:Stream = $("", null, "", "test");
+            var e:Stream = s.filter(not(empty(_)));
+            assertEquals(e.length, 1);
+            assertEquals(e.first, "test");
+        }
+
         [Test]
         public function testInvoke():void
         {