Exam 70-480 topic 1 question 24 discussion

Actual exam question from Microsoft's 70-480

Question #: 24
Topic #: 1

You are developing an application that uses a third-party JavaScript library named doWork().
The library occasionally throws an "object is null or undefined" error with an error code of
-2146823281.
The application must:
✑ Extract and handle the exceptions thrown by doWork()
✑ Continue normal program execution if other exceptions occur
You need to implement the requirements.
Which code segment should you use?

A. Option A
B. Option B
C. Option C
D. Option D

Show Suggested Answer

Suggested Answer: C 🗳️
* The try statement lets you test a block of code for errors.
The catch statement lets you handle the error.
The JavaScript statements try and catch come in pairs:
try {

Block of code to try -
}
catch(err) {

Block of code to handle errors -
}
* object.number [= errorNumber]
Returns or sets the numeric value associated with a specific error. The Error object's default property is number.
* Example:
The following example causes an exception to be thrown and displays the error code that is derived from the error number. try
{
// Cause an error.
var x = y;
}
catch(e)
{
document.write ("Error Code: ");
document.write (e.number & 0xFFFF)
document.write ("<br />");
document.write ("Facility Code: ")
document.write(e.number>>16 & 0x1FFF)
document.write ("<br />");
document.write ("Error Message: ")
document.write (e.message)
}
The output of this code is as follows.

Error Code: 5009 -

Facility Code: 10 -

Error Message: 'y' is undefined -
Reference: JavaScript Errors - Throw and Try to Catch; number Property (Error) (JavaScript)

by designsfactory at April 4, 2025, 12:48 p.m.

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