Single Responsibility Principle: Why Each Function Should Do Only One Thing

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A developer essay on DEV Community argues that the Single Responsibility Principle (SRP) is one of the most impactful habits for writing clean, maintainable code. The principle states that every function should perform exactly one task, describable with a single verb phrase such as 'validateUserInput' or 'fetchUserProfile'. Functions that bundle multiple responsibilities — like validating input, querying a database, hashing passwords, and generating tokens all at once — become difficult to read, test, and debug. Breaking such functions into smaller, focused units improves readability, simplifies unit testing, and makes stack traces more useful when errors occur. The article illustrates the concept with a refactoring example in JavaScript, showing how a bloated authentication handler can be split into clearly separated, reusable functions.

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