javascript try catch example function
try catch is a good way to stop errors breaking your javascript.
here is the example from the firefox mozilla with a basic try catch logging the error to your console, rather than just breaking all the javascript on your page.
then after this try catch i will add another console log to see if the code is still functioning on the rest of the scripts.
so you can see if you check your console log that the try catch still throws an error but then the scripts continue to run on the page, so if i called the non existant function without the try catch it would not run the console log below that error message.
So if possible all functions should be run in this way to prevent script breaking calls.
Here you can see the console output showing the console log after the error.
When running this test in brave i get the error (which is expected):
(index):378 ReferenceError: nonExistentFunction is not defined at (index):376
if i run this without the catch it will not run any further code on the page and just return an error.
Here is the console after just calling the function with no try and catch statement, and it no longer runs any code after this error.
Javascript
try {
nonExistentFunction();
} catch (error) {
console.error(error);
// expected output: ReferenceError: nonExistentFunction is not defined
// Note - error messages will vary depending on browser
}
console.log('more tests... ');
// and this will break all the js on the page with an error.
nonExistentFunction();
console.log('test after breaking function');External Link for javascript try catch example function
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"Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn’t do anything. 'Are you feeling all right?' I asked her. 'I feel all sleepy,' she said. In an hour, she was unconscious. In twelve hours she was dead. The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her. That was...in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her. On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. ...I dedicated two of my books to Olivia, the first was ‘James and the Giant Peach’. That was when she was still alive. The second was ‘The BFG’, dedicated to her memory after she had died from measles. You will see her name at the beginning of each of these books. And I know how happy she would be if only she could know that her death had helped to save a good deal of illness and death among other children."
I just checked google books for BFG, and the dedication is there.
https://www.google.com.au/books/edition/_/quybcXrFhCIC?hl=en&gbpv=1
Roald Dahl, 1986
