JavaScript projects often outlive their initial frameworks, making maintainability a critical long-term concern. A new guide from DEV Community argues that lasting code depends on consistent habits rather than chasing trends. Writing for future developers—including your forgetful self six months from now—requires prioritizing clarity and predictability. This approach ensures that codebases remain readable and dependable as tools and teams evolve over time.

Core practices focus on intentional naming and function structure. Developers should use descriptive verbs for functions and nouns for variables, avoiding vague terms like 'data'. Keeping functions small and focused on a single responsibility makes them easier to test and reuse. The guide emphasizes separating concerns, such as isolating API calls from UI logic, to build a robust architecture that supports growth.

Predictability is another key pillar, achieved by preferring pure functions that avoid side effects and external state changes. Comments should explain the 'why' behind complex decisions rather than restating obvious logic. Consistency is vital, too, supported by automated tools like ESLint and Prettier. The guide also warns against overengineering simple tasks, advocating for incremental refactoring to keep the codebase healthy and adaptable.