Add limitFrom filter.

Author: addyosmani

filter-limitFrom.js

@@ -0,0 +1,43 @@
+/**
+ * Limit displayed items from an array from an offset
+ * 
+ * @param  {array} input
+ * @param  {integer} offset
+ * @param  {integer} limit
+ * @return {array}      
+ */
+PolymerExpressions.prototype.limitFrom = function (input, offset, limit) {
+    if (!(input instanceof Array) && !(input instanceof String)) return input;
+
+    limit = parseInt(limit, 10);
+
+    if (input instanceof String) {
+        if (limit) {
+            return limit >= 0 ? input.slice(offset, limit) : input.slice(limit, input.length);
+        } else {
+            return "";
+        }
+    }
+
+    var out = [],
+        i, n;
+
+    if (limit > input.length)
+        limit = input.length;
+    else if (limit < -input.length)
+        limit = -input.length;
+
+    if (limit > 0) {
+        i = offset;
+        n = limit;
+    } else {
+        i = input.length + limit;
+        n = input.length;
+    }
+
+    for (; i < n; i++) {
+        out.push(input[i]);
+    }
+
+    return out;
+};