By Dr Antonio Gulli
A suite of computer studying interview questions in Python and Spark
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Extra resources for A collection of Advanced Data Science and Machine Learning Interview Questions Solved in Python and Spark (II): Hands-on Big Data and Machine ... Programming Interview Questions) (Volume 7)
If you don’t have any of these, you can create them now. Trained software developers will go about this formally, through a process known as requirements analysis. But for small apps and simple systems, informal methods work quite well. Simply write up a page or two (or three) about your app, how it’s supposed to work, and how its users are supposed to interact with it, and that’s your documentation. Follow these steps to analyze your material: 1. Go through the material carefully and pull out • Nouns: These become candidate (not final) classes.
This OO approach is different from the procedural approach in the following ways: ✓ Every action in the recipe is explicitly associated with a single object. ✓ These objects and their capabilities were identified before the recipe program was written, so writing the program essentially involved composing interactions among objects. Writing programs as interactions among objects is the key idea behind OO programming. Chapter 2: Object-Oriented Design Principles Listing 2-6 shows a similar OO recipe for bouillon.
Several programming languages have a root class from which all classes are inherited. In the Objective-C framework, the class is called NSObject. NSObject is equivalent to the class Object in Java. A subclass is a class that inherits all the functionality from another class (known as the superclass). Furthermore, the subclass can override specific functionality by providing its own implementation of certain methods. The method of the superclass can still be called from the overriding method, if doing so makes sense.