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Checking if a variable is not nil and not zero in ruby
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Use 'or' instead of ||
– Orion Edwards
Nov 2 '08 at 4:57
94
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Error: CUICatalog: Invalid asset name supplied: (null), or invalid scale factor : 2.000000
... is trying to put nil in [UIImage imageNamed:]
Add symbolic breakpoint for [UIImage imageNamed:]
Add $arg3 == nil condition on Simulator, $r0 == nil condition on 32-bit iPhone, or $x2 == nil on 64-bit iPhone.
Run your application and see where debugger will stop.
P.S. Keep in mind this also ...
What does ** (double star/asterisk) and * (star/asterisk) do for parameters?
In the following method definitions, what does the * and ** do for param2 ?
22 Answers
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Why use getters and setters/accessors?
...d setters - that only get and set - instead of simply using public fields for those variables?
38 Answers
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Why is it impossible to build a compiler that can determine if a C++ function will change the value
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Why is it impossible to build such a compiler?
For the same reason that you can't write a program that will determine whether any given program will terminate. This is known as the halting problem, and it's one of those things that's not computable.
To be clear, you can w...
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
I'm working on getting my database to talk to my Java programs.
38 Answers
38
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What is the difference between an int and an Integer in Java and C#?
I was reading More Joel on Software when I came across Joel Spolsky saying something about a particular type of programmer knowing the difference between an int and an Integer in Java/C# (Object-Oriented Programming Languages).
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When should I use a struct rather than a class in C#?
...ure instead of a class if instances of the
type are small and commonly short-lived or are commonly embedded in
other objects.
Do not define a structure unless the type has all of the following characteristics:
It logically represents a single value, similar to primitive types (int...
Is “IF” expensive?
I can't, for the life of me, remember what exactly our teacher said that day and I'm hoping you would probably know.
16 Ans...
Conversion failed when converting date and/or time from character string while inserting datetime
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There are many formats supported by SQL Server - see the MSDN Books Online on CAST and CONVERT. Most of those formats are dependent on what settings you have - therefore, these settings might work some times - and sometimes not.
The way to ...