Code Smell 13 - Empty Constructors

No-Parameterized constructors are a code smell of an **invalid* object that will dangerously mutate.
Incomplete objects cause lots of issues.*

TL;DR: Pass the essence to all your objects so they will not need to mutate.

Problems

• Mutability

• Incomplete objects

• Concurrency inconsistencies between creation and essence setting.

• Setters

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Maxi Contieri ・ Feb 20 '21

#codenewbie #tutorial #oop #programming

Solutions

1. Pass the object's essence on creation

2. Create objects with their immutable essence.

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Maxi Contieri ・ Dec 19 '20

#webdev #programming #mutation #oop

Examples

• Some persistence frameworks in static typed languages require an empty constructor.

Exceptions

• Stateless objects. Always better solution than static class methods.

Sample Code

Wrong

class AirTicket {
   constructor() {     
  }
}

Right

class AirTicket {
   constructor(origin, destination, arline, departureTime, passenger) {     

  //...     
  }
}

Detection

Any linter can warn this (possible) situation.

More info

%[https://codexposed.hashnode.dev/constructors-demystified]

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Maxi Contieri ・ Dec 19 '20

#webdev #programming #mutation #oop

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Maxi Contieri ・ Oct 29 '20

#codenewbie #beginners #100daysofcode #oop

Tags

• Essence

• Incomplete

• Mutable

Conclusion

Always create complete objects. Make their essence immutable to endure through time.

Every object needs its essence to be a valid one since inception.

We should read Plato's ideas about immutability and create entities in a complete and immutable way.

These immutable objects favor bijection and survive the passing of time.

Credits

Photo by Brett Jordan in Pexels

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In a purely functional program, the value of a [constant] never changes, and yet, it changes all the time! A paradox!

Joel Spolski

Software Engineering Great Quotes

Maxi Contieri ・ Dec 28 '20

#codenewbie #programming #quotes #software

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This article is part of the CodeSmell Series.

How to Find the Stinky parts of your Code

Maxi Contieri ・ May 21 '21

#codenewbie #tutorial #codequality #beginners

Last update: 2021/06/18