NSAsserts

NSAssert(theDate == nil, @"Argument must be non-nil"); 

To deploy without NSAsserts:

In the Debug version, you will want all your asserts checked. In 

the Release configuration, you will not. I will typically block assertion checking in the Release configuration. 

To do this, bring up the build info by double-clicking the lottery target. Go to the Build tab and select the 

Release configuration. Under GCC Preprocessing, add NS_BLOCK_ASSERTIONS to the Preprocessor

NSAssert() works only inside Objective-C methods. If you need to check an assertion in a C function, use 

NSCAssert().