I will try to mention some software design topics which I think are important. These are:
- Law of Demeter
- Single Responsibility Principle
- Composition over Inheritance
- Primitive Obsession
- Listen to Tests
- Use Dependency Injection Technique
Law of Demeter(LoD)
LoD is a design guideline for developing software whose rules and benefits can be summarized as:
Rules (based on Wikipedia):
- Each class must be able to access to another class only the information and resources that are necessary for its legitimate purpose.
- Each unit should have only limited knowledge about other units.
- Each unit should only talk to its friends; don’t talk to strangers.
Benefits:
- It gives full control over class properties. You cannot change any property from outside of its class context. …
The extension functions should have a task related to the responsibility of the respective class. One of the most common mistakes made by developers is to write extension functions like a utility function. Here is an example to explain this better:
fun String.validateEmail(): Boolean {
//validation process
return result
}These types of functions should not be defined as extension functions. Storing the e-mail information as String does not mean that String class is associated with the e-mail information. Instead this validation should reside in a class like EmailValidator.
class EmailValidator {
fun validate(email: String): Boolean {
//validation process
return result
}…
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