Using underscore / underscore.string for stringStarts / stringEnds.

lib/util/util.js

@@ -13,6 +13,9 @@
 * limitations under the License.
 */
 
+var _ = require('underscore');
+_.mixin(require('underscore.string'));
+
 /**
 * Encodes an URI.
 *
@@ -87,15 +90,7 @@ exports.stringFormat = function (text) {
 * @return {Bool} True if the string starts with the prefix; false otherwise.
 */
 exports.stringStartsWith = function (text, prefix) {
-  if (!text) {
-    return false;
-  }
-
-  if (!prefix) {
-    return true;
-  }
-
-  return text.indexOf(prefix) === 0;
+  return _.startsWith(text, prefix);
 };
 
 /**
@@ -106,15 +101,7 @@ exports.stringStartsWith = function (text, prefix) {
 * @return {Bool} True if the string ends with the suffix; false otherwise.
 */
 exports.stringEndsWith = function (text, suffix) {
-  if (!text) {
-    return false;
-  }
-
-  if (!suffix) {
-    return true;
-  }
-
-  return text.lastIndexOf(suffix) === (text.length - suffix.length);
+  return _.endsWith(text, suffix);
 };
 
 /**

package.json

@@ -15,7 +15,9 @@
         "log": ">= 1.2.0",
         "xmlbuilder": ">= 0.3.1",
         "mime": ">= 1.2.4",
-        "dateformat": "1.0.2-1.2.3"
+        "dateformat": "1.0.2-1.2.3",
+        "underscore": ">= 1.3.1",
+        "underscore.string": ">= 2.0.0"
     },
     "devDependencies": {
         "nodeunit": ">= 0.6.4"