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And that s fine. The key is that you assign back to self, especially if you re accessing any instance variables. No matter which way you do it, be aware that combining the assignment and test is a common technique, and you ll see it a lot in other people s code. The self = [super init] style is the source of some controversy. One faction says you should always do this, just in case the superclass changes something in the initialization. The other camp says that this object changing is so rare and obscure that you need not bother just use a plain [super init]. Those in this camp point out that if even if the init changes the object, that new object probably doesn t take any new instance variables you have added. This is a truly thorny problem in the abstract, but in the real world, it doesn t happen very often. We recommend always using the if (self = [super init]) technique just to be safe and to catch the init returning nil behavior of some init methods. But if you choose to use a plain [super init], that s fine too. Just be prepared to do a little debugging if you happen to catch one of the obscure corner cases.

Figure 16-5 Running the application (first image)

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What should you put in your init methods This is the place to do your clean-slate initialization work. You assign values to instance variables and create the other objects that your object needs to do its work. When you write your init methods, you must decide how much work you want to do there. The CarParts programs showed two different approaches over the course of its evolution. The first way used the init method to create the engine and all four tires. This made the Car immediately useful out of the box: call alloc and init, and take the car out for a test drive. We changed the next version to create nothing at all in the init method. We just left empty spaces for the engine and tires. The code that created the object would then have to create an engine and tires and set them using accessor methods. Which way is right for you The decision comes down to flexibility over performance, as do many tradeoffs in programming. The original Car init method is very convenient. If the intended use of the Car class is to create a basic car and then use it, that s the right design.

The previous section deals with risks inherent in the business These are risks that the current owner lives with This section deals with risks that are unique to the buyer There are two main categories of risks that are unique to the buyer: (1) The risk that the seller is dishonest; and (2) The risk that the business is highly dependent on the seller and will fall apart after he or she leaves Both risks are significant, but I call the latter, The Big Banana, because it is usually the largest impediment to creating value

(continued)

Figure 16-6 Running the application (second image)

On the other hand, if the car will often be customized with different kinds of tires and engines, as in a racing game, we ll be creating the engine and tires just to have them thrown away. Such a waste! Objects would be created and then destroyed without ever being used.

The most important step the seller can take to reduce a buyer s fear of being taken to the cleaners is to get audited financial statements for at least three and preferably five years before selling the business Since audits are expensive, obviously this applies only to businesses of some substance, as the cost of the audits must be

You would normally never load an entire database at once in a real application, especially when using large blobs, like this example Memory is limited in an iOS device only load what you need when you need it

Even if you don t provide calls to customize your object s attributes, you can still wait to create them until a caller asks for them. This is a technique known as lazy evaluation, and it can give you a performance boost if you re creating complex objects in your -init that might not actually be used.

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