There would be NO performance impact to impose the check.
Always perform range-checking as it will most likely break under
circumstances outside of your development environment. It's not just a
matter of style.
On Aug 18, 2009, at 11:11 AM, Chris Paveglio wrote:
This is a question of style.
My app has text fields to display a number, and with a command I
format it like a phone number. So for the second phone number,
sometime there is not a second phone (or fax). So my command to
format the 2nd phone number logs an error to the console when I run
it:
NSString *formattedFax = [NSString stringWithFormat:@"%...@-%@-%@",
[originalFax substringWithRange:NSMakeRange(0,3)], etc...
*** -[NSCFString substringWithRange:]: Range or index out of bounds
But if there is not a second phone/fax number, I don't really care
if this line fails. I certainly *could* write a check like "if
(originalFax != @"") then... continue with function". But would that
take more time to process?
So SHOULD I write the check to make sure the data is valid or not?
Or just let the function fail because its faster and has no lasting
impact? Is it OK if this line quietly (to the user) fails?
Thanks, Chris
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