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.
if( doWork() == -2146823281) {
…
}
B.
if( doWork() == “object is null or undefined”) {
…
}
C.
try {
doWork();
} catch(e) {
if(e.number == -2146823281)
…
}
D.
try {
doWork();
} catch(e) {
if(e.message == -2146823281)
…
}
Not sure about this but it looks like it is only supported in IE.
http://help.dottoro.com/ljfhismo.php
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J, I agree, nevertheless the questions says:
“The library occasionally throws an ‘object is null or undefined’ error with an error code of -2146823281.”
In my view, this means that this error would have “object is null or undefined” as message and as it talks about ‘code’, I would say “-2146823281” as number
Therefore in this context, regardless of the browser compatibility, I would say C is the right answer because I can’t see that code being saved anywhere else in the error object.
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