This content originally appeared on DEV Community 👩💻👨💻 and was authored by Maxi Contieri
We see small primitive data everywhere
TL;DR: Don't forget to model the smallest ones
Problems
- Primitive obsession
Solutions
find responsibilities for small objects in the MAPPER
Reify them
Context
Since computing early days we map all we see to the familiar primitive data types: Strings, Integers, Collections, etc.
Mapping to dates violates abstraction and fail-fast principles.
in the Wordle TDD Kata, we describe a Wordle word to be different than a String or Char(5), since they don't have the same responsibilities.
Sample Code
Wrong
public class Person {
private final String name;
public Person(String name) {
this.name = name;
}
}
Right
public class Name {
private final String name;
public Name(String name) {
this.name = name;
// Name has its own creation rules, comparison etc.
// Might be different than a string
}
}
public class Person {
private final Name name;
public Person(Name name) {
// name is created as a valid one,
// we don't need to add validations here
this.name = name;
}
}
Detection
[X] Manual
This is a semantic smell. It is related to design activity
Exceptions
In a very small number of mission-critical systems, we have a tradeoff from abstraction to performance.
This is not the usual case. We do premature optimization not relying on a modern computer and virtual machine optimizations.
As always, we need to stick to evidence in real-world scenarios.
Tags
- Primitive
Conclusion
Finding small objects is a very hard task requiring experience to make a good job and avoid overdesign.
There's no silver bullet in choosing how and when to map something.
Relations
More Info
Disclaimer
Code Smells are just my opinion.
Credits
Photo by Shane Aldendorff on Unsplash
The secret to building large apps is never build large apps. Break your applications into small pieces. Then, assemble those testable, bite-sized pieces into your big application.
Justin Meyer
This article is part of the CodeSmell Series.
This content originally appeared on DEV Community 👩💻👨💻 and was authored by Maxi Contieri
Maxi Contieri | Sciencx (2022-11-05T13:42:54+00:00) Code Smell 177 – Missing Small Objects. Retrieved from https://www.scien.cx/2022/11/05/code-smell-177-missing-small-objects/
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