Replace isWhitespaceAt with trimmedLeftIndex and trimmedRightIndex.

lodash.js

@@ -39,7 +39,7 @@
     '\n\r\u2028\u2029' +
 
     // unicode category "Zs" space separators
-    '\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000'
+    '\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000'
   );
 
   /** Used to match empty string literals in compiled template source */
@@ -440,23 +440,6 @@
     return typeof value.toString != 'function' && typeof (value + '') == 'string';
   }
 
-  /**
-   * Checks the given string to determine if the character at the specified
-   * index is whitespace.
-   *
-   * @private
-   * @param {string} string The string to inspect.
-   * @param {number} index The character index.
-   * @returns {boolean} Returns `true` if specifed character is whitespace, else `false`.
-   */
-  function isWhitespaceAt(string, index) {
-    var c = string.charCodeAt(index);
-    return (
-      (c <= 160 && (c >= 9 && c <= 13) || c == 32 || c == 160) || c == 5760 || c == 6158 ||
-      (c >= 8192 && (c <= 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288 || c == 65279))
-    );
-  }
-
   /**
    * Releases the given array back to the array pool.
    *
@@ -515,6 +498,46 @@
     return result;
   }
 
+  /**
+   * Gets the index of the first non-whitespace character of a given string.
+   *
+   * @private
+   * @param {string} string The string to inspect.
+   * @returns {number} Returns the index of the first non-whitespace character.
+   */
+  function trimmedLeftIndex(string) {
+    var index = -1,
+        length = string.length;
+
+    while (++index < length) {
+      var c = string.charCodeAt(index);
+      if (!((c <= 160 && (c >= 9 && c <= 13) || c == 32 || c == 160) || c == 5760 || c == 6158 ||
+          (c >= 8192 && (c <= 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288 || c == 65279)))) {
+        break;
+      }
+    }
+    return index;
+  }
+
+  /**
+   * Gets the index of the last non-whitespace character of a given string.
+   *
+   * @private
+   * @param {string} string The string to inspect.
+   * @returns {number} Returns the index of the last non-whitespace character.
+   */
+  function trimmedRightIndex(string) {
+    var index = string.length;
+    while (index--) {
+      var c = string.charCodeAt(index);
+      if (!((c <= 160 && (c >= 9 && c <= 13) || c == 32 || c == 160) || c == 5760 || c == 6158 ||
+          (c >= 8192 && (c <= 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288 || c == 65279)))) {
+        break;
+      }
+    }
+    return index;
+  }
+
   /*--------------------------------------------------------------------------*/
 
   /**
@@ -1942,16 +1965,10 @@
     // fallback for environments without a proper `String#trim`
     if (!nativeTrim || nativeTrim.call(whitespace)) {
       trim = function(string) {
-        var start = -1,
-            end = string ? string.length : 0;
-
-        if (!end || string == null) {
-          return '';
-        }
-        string = String(string);
-        while (++start < end && isWhitespaceAt(string, start)) { }
-        while (end-- && isWhitespaceAt(string, end)) { }
-        return string.slice(start, end + 1);
+        string = string == null ? '' : String(string);
+        return string
+          ? string.slice(trimmedLeftIndex(string), trimmedRightIndex(string) + 1)
+          : string;
       };
     }