Which of the following is correct about structural design patterns?
Explanation. Structural design patterns concern class and object composition. Concept of inheritance is used to compose interfaces and define ways to compose objects to obtain new functionalities. Q 6 – Which of the following is correct about Behavioral design patterns.
Which of the following is true regarding refactoring?
Refactoring should always introduce new functionality to a code base. Refactoring does not introduce new end-user features. Refactoring should not be performed to enhance code modularity. Refactoring should never be done in conjunction with regression testing.
Why is it beneficial for the client to be able to treat objects in a hierarchy uniformly using the composite pattern?
The Composite pattern lets you run a behavior recursively over all components of an object tree. The greatest benefit of this approach is that you don’t need to care about the concrete classes of objects that compose the tree. You don’t need to know whether an object is a simple product or a sophisticated box.
What are patterns explain in brief?
A pattern is a regularity in the world, in human-made design, or in abstract ideas. As such, the elements of a pattern repeat in a predictable manner. A geometric pattern is a kind of pattern formed of geometric shapes and typically repeated like a wallpaper design. Any of the senses may directly observe patterns.
What do you mean by part-whole hierarchy?
We know tree structure what a tree structure is and some of us don’t know what a part-whole hierarchy is. A system consists of subsystems or components. Components can further be divided into smaller components. Further smaller components can be divided into smaller elements. This is a part-whole hierarchy.
When to refactor the structure of a React project?
In general, React project structures are often iteratively evolved alongside the project’s scope and complexity. When new libraries are added, such as Redux and React Router, the initial structure needs to be refactored to accommodate the added complexity.
What’s the difference between refactoring and modifying code?
If the interface to a piece of code changes, then I consider that more than refactoring.
How often should you do architecture refactoring in TDD?
In an agile or iterative/incremental development process, architecture refactoring is an activity that should be conducted at least once per iteration. Refactoring in general is considered mandatory in TDD. Unfortunately, unsystematic refactoring activities can cause more harm than good.
What’s the difference between unit testing and refactoring?
Refactoring goes hand-in-hand with unit testing. Write tests before you refactor and then you have a confidence level in the refactoring (proportional to the coverage of the tests). Fowler draws a clean line between changes to code that do, and those that do not, affect its behavior.