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professional-javascript-14-DebugExample5.htm / htm

          <title>Debug Example</title>
          <script type="text/javascript">
                  function assert(bCondition, sErrorMessage) {
                      if (!bCondition) {
                          throw new Error(sErrorMessage);
                  function divide(iNum1, iNum2) {
                      assert(arguments.length == 2, "divide() requires two arguments.");
                      assert(typeof iNum1 == "number" && typeof iNum2 == "number", 
                                        "divide() requires two numbers for arguments.");
                      return iNum1.valueOf() / iNum2.valueOf();
          <p>This page uses assertions to throw a custom JavaScript error.</p>

(C) Æliens 20/2/2008

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