Josh Adams

Well, notice that, while our Adolescent class, which provided its own convenience initializer, retained access to all of the Adult class’s initializers, because NestLeaver provides a designated initializer, it unceremoniously loses access to all of Adult’s initializers. To tie in the metaphor: just as most grown-ups cannot readily expect ongoing assistance from their …

Note: Inside init(age:), we call self.init(name:age:) instead of super.init(name:age:) because we have inherited Adult’s designated initializer. The compiler requires us to delegate to our own inherited version of the method.

When I have trouble grasping a seemingly difficult topic, what I like to do is find a real-world situation or circumstance to help me conceptualize it. To that end, I’ve come up with a metaphor encapsulating how class initializers work, specifically in the case of inheritance.

…s. And while these methods are indeed useful, and many times preferable to the use of initializers, I’m the kind of person who feels that things aren’t quite right so long as I remain confused about a basic element of a larger topic. The fact is, everybody will have to use initializers at some point in their Swift programming lives. It’s better to understand what you’re doing than it is to rely on Xcode to fix the problem, or to forego initializers in situations where they genuinely are the best solution simply because they’re painful to wrap your head around.

Conversely, if the target parameter was set to nil, Cocoa Touch would’ve kept traveling up the responder chain until it found an object who could respond to logIt: — a useful (and sometimes error prone) technique within iOS programming.

When one desires implicit sharing - or - the framework demands it.

“!” is a promise to yourself, other developers using your code, and your users that the value should never be “nil”.

“?” means that you, the developer, expect the value to sometimes be “nil”, and will handle that case.

The only way you can rightfully judge a person is if you are aware of every single event that that person has experienced in his life to get to the moment you deem criticizable.

Understand that when starting a new diet, exercise routine, or productivity method, you will not be thinking with the same “cool head” you have when you are planning it. When it comes time to execute your plan, you will be tired, you will be tempted and you will want to take the easy way out. In those situations, you must have a pre-commitment that no matter how tired or tempted you are, you will stick to your goal.