Catching generic Exceptions in Swift 2.0

Erro handeling is always a chalange in any development enviroment.


In general, we will never spot an error if we log or catch. Only developers will see those, and if you're muffling to avoid user-visible behavior, succeeding means nobody will notice!

So our guideline is: 

"if it's something wrong that we want to fix, let it crash, find and fix before release. "

If it's something wrong that might seriously impact the user experience, or is not indicative of a programming error, then muffle but make sure we have a test or some other way to find the problem. 

Or make sure that failure propagates around the application through some other kind of logic — return values, fall through, whatever. 

Also: if you write 'catch Exception', consider writing 'Throwable' instead. I often see this:

  // This might run out of memory. 

  catch (Exception e) {

which won't work — Exception and Error are siblings, and OOMs are OutOfMemoryErrors. That'll catch everything but an Error!

I am a huge fan of open source Firefox iOS Developed in Swift and consider it as an inspiration.
I found the following discussion on bugzilla 

Inspired by buzilla form - 

Richard Newman

https://mail.mozilla.org/pipermail/mobile-firefox-dev/2015-August/001451.html

Bugzilla - https://bugzilla.mozilla.org/show_bug.cgi?id=1191067#c25

Github - https://github.com/mozilla/firefox-ios