Add left and right only trimming capabilities

Author: Marcos Placona

demo.html

@@ -88,9 +88,15 @@ <h3>random</h3>
 
     <h3>length</h3>
     {{'Hello World' | length}}
+	
+	<h3>ltrim</h3>
+    {{'    I was a string with leading whitespace' | ltrim}}
+	
+	<h3>rtrim</h3>
+    {{'I was a string with trailing whitespace    ' | rtrim}}
 
     <h3>trim</h3>
-    {{' I was a string with leading and trailing whitespace    ' | trim}}
+    {{'    I was a string with leading and trailing whitespace    ' | trim}}
 
     <h3>list</h3>
     {{colors | list}}

filter-ltrim.js

@@ -0,0 +1,8 @@
+/**
+ * Left trim a string, removing leading whitespace
+ * @param  {string} input
+ * @return {string} left trimmed string
+ */
+PolymerExpressions.prototype.ltrim = function(input){
+	return input.replace(/^\s+/, '');
+}

filter-rtrim.js

@@ -0,0 +1,8 @@
+/**
+ * Right trim a string, removing trailing whitespace
+ * @param  {string} input
+ * @return {string} left trimmed string
+ */
+PolymerExpressions.prototype.rtrim = function(input){
+	return input.replace(/\s+$/, '');
+}

polymer-filters.html

@@ -13,6 +13,8 @@
 <script src="filter-round.js"></script>
 <script src="filter-truncate.js"></script>
 <script src="filter-titlecase.js"></script>
+<script src="filter-ltrim.js"></script>
+<script src="filter-rtrim.js"></script>
 <script src="filter-trim.js"></script>
 <script src="filter-length.js"></script>
 <script src="filter-list.js"></script>
@@ -47,6 +49,18 @@
 
 > Hello Peeps
 
+####LTrim
+
+    {{'    I was a string with leading whitespace' | ltrim}}
+
+> I was a string with leading whitespace
+
+####RTrim
+
+    {{'I was a string with trailing whitespace    ' | rtrim}}
+
+> I was a string with trailing whitespace
+
 ####Trim
 
     {{' I was a string with leading and trailing whitespace    ' | trim}}