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Do you have a spec Do your programmers have quiet working conditions Do you use the best tools money can buy Do you have testers Do new candidates write code during their interview Do you do hallway usability testing

Can you see why the second version would be safer Here s a hint. A very common mistake made by C programmers, even expert C programmers, is to type = when they mean to type ==. In this example, that would lead to an if that looked like this:

One of the earliest projects to bridge a non-Objective-C language with the Cocoa frameworks is PyObjC, which lets you do a significant amount of Cocoa development in Python. As you re well aware by this point, Objective-C s syntax, in particular the intermixing of method names and arguments, is somewhat unusual, and most other languages don t have any equivalent. What PyObjC does is provide mappings for all methods in all Objective-C classes included in Cocoa, so that you can call them from Python. The mappings are determined by a pretty simple formula: the entire Objective-C method name is pushed into a single symbol, with each colon in the method name replaced by an underscore character. All the method arguments are sent between parentheses, just like a standard C function. All objects are automatically bridged, so that you can use all the standard Cocoa classes right from Python. For example, let s look at a line of code we showed earlier, when talking about notifications. Here s the Objective-C version:

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With the deferred exception of item 11, you should be answering yes to all of these questions. If you ve ever wondered why Joel Spolsky is so popular with his fellow programmers, posts like The Joel Test are why they offer great advice that makes a real difference in one s ability to execute. Now, you may want to argue with some of the items on the Joel Test, but can you honestly say that if you re going to be a professional developer they don t apply I don t think so.

if ( myInt = 0 )

This if will first assign the value of 0 to the variable myInt, not at all what you intended. Even worse, this code will compile, so the compiler won t be able to clue you in to your mistake by reporting an error. If you used the second form of if, your mistake would look like this:

[[NSNotificationCenter defaultCenter] postNotificationName:DATA_RECEIVED object:self];

Joel posted his test to Joel on Software way back in 2000. (You could do a lot worse in terms of professional education reading his posts from that era on.) Meanwhile, Joel and well-known programmer Jeff Atwood have tackled a major inefficiency in how most developers develop. Tell me if this sounds familiar: You re programming away in your language of choice and you hit a roadblock, a bug you can t figure out, a hole in your mental database of programming expertise. So you Google it. And before you know it, you re sifting through umpteen blog posts, code snippets, forum posts trying to figure out which pages have information that s valid and pertinent today. Guess what You ve just spent an hour on this one problem, because Google shows answers based, not on how correct they are today, but on how many hits and links they ve received cumulatively. You ve just again gotten into the Google loop. Joel s and Jeff s and your antidote to the Google loop is Stack Overflow (http://stackoverflow.com; Figure 8-4). Begun in 2008, Stack Overflow is an intelligent way for programmers to ask specific technical questions and get them answered in a timely way. Stack Overflow now gets over 600,000 page views and 250,000 visitors a day a substantial portion of all programmers.

if ( 0 = myInt )

The Python version, using PyObjC, looks something like this:

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