What is the SOLID Principle and Why it is important for a Software Developer?

by Sachin Varma - Sep 15, 2020
Solid Principles are fundamentally a set of 5 standards which when followed will result in a program being substantially more simple to maintain, bug-free, and quicker to create.
When a developer builds his software program following an awful plan, the code can become unbendable and weaker. Small changes in the software can bring about a countless number of bugs. However, if the SOLID Principles are applied appropriately, it makes the code more extendable, coherent, and simpler to peruse.  Hence, we ought to follow these principles more often.
The following principles are what makes up SOLID:
1) Single Responsibility Principle
2) Open-Closed Principle
3) Liskov Substitution Principle
4) Interface Segregation Principle
5) Dependency Inversion Principle
Single Responsibility Principle 
The Single responsibility guideline (SRP) states that there ought to never be more than one explanation behind a class to change. This implies that one class should just fill one need, this doesn't suggest that each class ought to have just one technique, yet they should all relate straightforwardly to the obligation of the class. At the point when a class fills for numerous needs/obligations then it ought to be made into another class. When a class has various obligations, the odds that it should be changed increments. Each time a class is changed the danger of presenting bugs develops. By focusing on a solitary obligation, this hazard is constrained.
Open-Closed Principle 
The Open-Closed Principle (OCP) determines that software elements (classes, modules, functions, and so on.) ought to be open for expansion however shut for change. The 'Open' part says that you ought to have the option to stretch out existing code to present new usefulness. The 'Closed' portion of the standard expresses that once a module has been developed and tested, the code should just be changed per the right bugs. This guideline decreases the danger of new blunders being acquainted by restricting changes with existing code.
Liskov Substitution Principle 
The Liskov substitution principle (LSP) states that 'objects in a program ought to be replaceable with occasions of their subtypes without changing the accuracy of that program'.  On the off chance that you make a Class with a reliance of a given sort, you ought to have the option to give an object of that type or any of its subclasses without presenting surprising outcomes and without the needy class knowing the genuine kind of the given reliance. On the off chance that the kind of reliance must be checked with the goal that conduct can be altered by type, or if subtypes created sudden rules or effects, the code may turn out to be more mind-boggling, unbending, and delicate.
Interface Segregation Principle 
The Interface Segregation Principle (ISP) determines that customers ought not be compelled to rely on interfaces that they don't utilize. This standard implies that when one class relies on another, the number of individuals in the interface that is obvious to the needy class ought to be limited. Frequently when you make a class with countless techniques, the class is utilized by different sorts that just expect access to a couple of members. The classes are all the more firmly coupled as the number of members they know about develops. At the point when you follow the ISP, enormous classes actualize different little interfaces that gather capacities as indicated by their use. The dependents are connected to these for looser coupling, expanding vigor, adaptability, and the chance of reuse. 
Reliance Inversion Principle 
The Dependency Inversion Principle (DIP) offers two expressions. The first is that elevated level modules ought not to rely on low-level modules. Both ought to rely on reflections. The second piece of the standard is that abstractions ought not to rely on subtleties. Subtleties ought to rely on abstractions. The DIP principally identifies with the idea of layering inside applications, where lower-level modules manage extremely nitty gritty capacities and more significant level modules use lower-level classes to accomplish bigger assignments. The guideline determines that where conditions exist between classes, they ought to be characterized by utilizing reflections, for example, interfaces, instead of by referencing classes straightforwardly. This decreases delicacy brought about by changes in low-level modules presenting bugs in the higher layers.

By applying these 5 principles that make the SOLID abbreviation, we get the chance to profit by a reusable, viable, versatile and simple testable codebase. These are 5 basic standards utilized by proficient programming engineers all around the world, and if you are not kidding about making 'strong' programming, you should begin applying these standards today!


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