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professional-javascript-14-AssertExample.htm / htm

          <title>Try Catch Example</title>
          <script type="text/javascript">
                  function assert(bCondition, sErrorMessage) {
                      if (!bCondition) {
                          throw new Error(sErrorMessage);
                  function addTwoNumbers(a, b) {
                      assert(arguments.length == 2, "Two numbers are required.");
                      return a + b;
                  try {
                      result = addTwoNumbers(90);
                  } catch (oException) {
                      alert(oException.message);      //outputs "Two numbers are required."

(C) Æliens 20/2/2008

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