--- a/nashorn/src/jdk/nashorn/internal/objects/NativeString.java	Fri Aug 23 15:46:09 2013 +0200
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeString.java	Fri Aug 23 12:20:19 2013 -0300
@@ -1058,9 +1058,8 @@
     public static Object trim(final Object self) {
 
         final String str = checkObjectToString(self);
-        final int len = str.length();
         int start = 0;
-        int end   = len - 1;
+        int end   = str.length() - 1;
 
         while (start <= end && ScriptRuntime.isJSWhitespace(str.charAt(start))) {
             start++;
@@ -1069,7 +1068,45 @@
             end--;
         }
 
-        return start == 0 && end + 1 == len ? str : str.substring(start, end + 1);
+        return str.substring(start, end + 1);
+    }
+
+    /**
+     * Nashorn extension: String.prototype.trimLeft ( )
+     * @param self self reference
+     * @return string trimmed left from whitespace
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE)
+    public static Object trimLeft(final Object self) {
+
+        final String str = checkObjectToString(self);
+        int start = 0;
+        int end   = str.length() - 1;
+
+        while (start <= end && ScriptRuntime.isJSWhitespace(str.charAt(start))) {
+            start++;
+        }
+
+        return str.substring(start, end + 1);
+    }
+
+    /**
+     * Nashorn extension: String.prototype.trimRight ( )
+     * @param self self reference
+     * @return string trimmed right from whitespace
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE)
+    public static Object trimRight(final Object self) {
+
+        final String str = checkObjectToString(self);
+        int start = 0;
+        int end   = str.length() - 1;
+
+        while (end >= start && ScriptRuntime.isJSWhitespace(str.charAt(end))) {
+            end--;
+        }
+
+        return str.substring(start, end + 1);
     }
 
     private static Object newObj(final Object self, final CharSequence str) {

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8019987.js	Fri Aug 23 12:20:19 2013 -0300
@@ -0,0 +1,171 @@
+/*
+ * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * JDK-8019987: String trimRight and trimLeft could be defined.
+ *
+ * @test
+ * @run
+ */
+
+var TESTSTRING = "abcde";
+
+var SPACES                       = "     ";
+var TESTSTRING_LEFT_SPACES       = SPACES + TESTSTRING;
+var TESTSTRING_RIGHT_SPACES      = TESTSTRING + SPACES;
+var TESTSTRING_BOTH_SPACES       = SPACES + TESTSTRING + SPACES;
+var TESTSTRING_MIDDLE_SPACES     = TESTSTRING + SPACES + TESTSTRING;
+
+var WHITESPACE =
+        " \t"    + // space and tab
+        "\n\r"   + // newline and return
+        "\u2028" + // line separator
+        "\u2029" + // paragraph separator
+        "\u000b" + // tabulation line
+        "\u000c" + // ff (ctrl-l)
+        "\u00a0" + // Latin-1 space
+        "\u1680" + // Ogham space mark
+        "\u180e" + // separator, Mongolian vowel
+        "\u2000" + // en quad
+        "\u2001" + // em quad
+        "\u2002" + // en space
+        "\u2003" + // em space
+        "\u2004" + // three-per-em space
+        "\u2005" + // four-per-em space
+        "\u2006" + // six-per-em space
+        "\u2007" + // figure space
+        "\u2008" + // punctuation space
+        "\u2009" + // thin space
+        "\u200a" + // hair space
+        "\u202f" + // narrow no-break space
+        "\u205f" + // medium mathematical space
+        "\u3000" + // ideographic space
+        "\ufeff";  // byte order mark
+var TESTSTRING_LEFT_WHITESPACE   = WHITESPACE + TESTSTRING;
+var TESTSTRING_RIGHT_WHITESPACE  = TESTSTRING + WHITESPACE;
+var TESTSTRING_BOTH_WHITESPACE   = WHITESPACE + TESTSTRING + WHITESPACE;
+var TESTSTRING_MIDDLE_WHITESPACE = TESTSTRING + WHITESPACE + TESTSTRING;
+
+function escape(string) {
+    var sb = new java.lang.StringBuilder();
+    sb.append("\"");
+
+    for (var i = 0; i < string.length; i++) {
+        var ch = string.charAt(i);
+
+        switch (ch) {
+        case '\\':
+            sb.append("\\\\");
+            break;
+        case '"':
+            sb.append("\\\"");
+            break;
+        case '\'':
+            sb.append("\\\'");
+            break;
+        case '\b':
+            sb.append("\\b");
+            break;
+        case '\f':
+            sb.append("\\f");
+            break;
+        case '\n':
+            sb.append("\\n");
+            break;
+        case '\r':
+            sb.append("\\r");
+            break;
+        case '\t':
+            sb.append("\\t");
+            break;
+        default:
+            var code = string.charCodeAt(i);
+
+            if (code < 0x20 || code >= 0xFF) {
+                sb.append("\\u");
+
+                var hex = java.lang.Integer.toHexString(code);
+                for (var i = hex.length; i < 4; i++) {
+                    sb.append('0');
+                }
+                sb.append(hex);
+            } else {
+                sb.append(ch);
+            }
+
+            break;
+        }
+    }
+
+    sb.append("\"");
+
+    return sb.toString();
+}
+
+var count = 0;
+function test(expected, trimmed) {
+    count++;
+    if (trimmed != expected) {
+        print(count + ": Expected: " + escape(expected) + ", found: " + escape(trimmed));
+    }
+}
+
+test("",                           SPACES.trim());
+test("",                           SPACES.trimLeft());
+test("",                           SPACES.trimRight());
+
+test(TESTSTRING,                   TESTSTRING_LEFT_SPACES.trim());
+test(TESTSTRING,                   TESTSTRING_LEFT_SPACES.trimLeft());
+test(TESTSTRING_LEFT_SPACES,       TESTSTRING_LEFT_SPACES.trimRight());
+
+test(TESTSTRING,                   TESTSTRING_RIGHT_SPACES.trim());
+test(TESTSTRING_RIGHT_SPACES,      TESTSTRING_RIGHT_SPACES.trimLeft());
+test(TESTSTRING,                   TESTSTRING_RIGHT_SPACES.trimRight());
+
+test(TESTSTRING,                   TESTSTRING_BOTH_SPACES.trim());
+test(TESTSTRING_RIGHT_SPACES,      TESTSTRING_BOTH_SPACES.trimLeft());
+test(TESTSTRING_LEFT_SPACES,       TESTSTRING_BOTH_SPACES.trimRight());
+
+test(TESTSTRING_MIDDLE_SPACES,     TESTSTRING_MIDDLE_SPACES.trim());
+test(TESTSTRING_MIDDLE_SPACES,     TESTSTRING_MIDDLE_SPACES.trimLeft());
+test(TESTSTRING_MIDDLE_SPACES,     TESTSTRING_MIDDLE_SPACES.trimRight());
+
+test("",                           WHITESPACE.trim());
+test("",                           WHITESPACE.trimLeft());
+test("",                           WHITESPACE.trimRight());
+
+test(TESTSTRING,                   TESTSTRING_LEFT_WHITESPACE.trim());
+test(TESTSTRING,                   TESTSTRING_LEFT_WHITESPACE.trimLeft());
+test(TESTSTRING_LEFT_WHITESPACE,   TESTSTRING_LEFT_WHITESPACE.trimRight());
+
+test(TESTSTRING,                   TESTSTRING_RIGHT_WHITESPACE.trim());
+test(TESTSTRING_RIGHT_WHITESPACE,  TESTSTRING_RIGHT_WHITESPACE.trimLeft());
+test(TESTSTRING,                   TESTSTRING_RIGHT_WHITESPACE.trimRight());
+
+test(TESTSTRING,                   TESTSTRING_BOTH_WHITESPACE.trim());
+test(TESTSTRING_RIGHT_WHITESPACE,  TESTSTRING_BOTH_WHITESPACE.trimLeft());
+test(TESTSTRING_LEFT_WHITESPACE,   TESTSTRING_BOTH_WHITESPACE.trimRight());
+
+test(TESTSTRING_MIDDLE_WHITESPACE, TESTSTRING_MIDDLE_WHITESPACE.trim());
+test(TESTSTRING_MIDDLE_WHITESPACE, TESTSTRING_MIDDLE_WHITESPACE.trimLeft());
+test(TESTSTRING_MIDDLE_WHITESPACE, TESTSTRING_MIDDLE_WHITESPACE.trimRight());