A well-designed API and its accompanying documentation should be all you need to know to make good use of the code that implements it Donald Trump Coin 2020 shirt. In fact, a very good principle is that everything ‘behind’ an API should be deliberately hidden, as it’s not part of the deal – it is what makes it work, but you should not need to know how that works. It’s what is called an ‘implementation detail’, and it’s private.
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An analogy is the throttle pedal in your car that is the public interface to the engine speed control Donald Trump Coin 2020 shirt, but you don’t need to know exactly how the pedal causes the engine’s speed to change to make use of it. One car might use a cable to a mechanical throttle, another might just be a sensor that inputs into the engine management system. It doesn’t change the way you use the pedal, and in both cases, the overall effect is the same. A system like Android or Windows consists of tens of thousands of APIs, typically organized into functional groups, such as networking, or graphics.
You can create programs that run on these systems and use these APIs without understanding any of the implementation details at all. Any time you require knowledge of implementation detail to use a library properly, it is indicative of either bad design or an incomplete API. That’s where you should look when you want to program apps or other pieces of software for these systems. As in any field, there is a limited supply of proven competent professionals and an even more limited supply of those capable of doing certain jobs.