Single Point of Truth

Core Concept

The SPOT, or Single Point of Truth, principle is a better and more semantically-focused interpretation of DRY (Don't Repeat Yourself).

The principle suggests that for any given piece of information, there should only be one authoritative location where that data is defined or set. This is related with the Single Responsibility Principle , where the point of truth has only one job to do.

For instance, if there's a rule that pizzas need at least one topping, there should be a single place in the code where that condition is articulated. By maintaining a single source of truth, it ensures that when changes need to be made, they aren't sporadically made in one place but not the others.

Benefits of SPOT:

• Consistency: You ensure that the data (in this case, the username) is consistent across the application because there's only one source of truth.
• Maintainability: If you need to change the rules for usernames (e.g., minimum length, allowed characters), you only need to modify the isValidUsername method in the User class.
• Reduced Bugs: By centralizing the logic, you reduce the chances of having conflicting or inconsistent behavior related to the data.
• Improved Readability: The code becomes clearer as the responsibility for managing a specific piece of data is localized.

Sources

• https://mitrapunk.com/single-source-of-truth/