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What is the official Angular style guide, and why is it useful for a team? What is the single responsibility principle and how does it apply to writing Angular components and services? Why does the Angular style guide recommend using the OnPush change detection strategy where possible? What are some best practices for structuring a large Angular application with many features?
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Why does the Angular style guide recommend keeping components small and focused rather than very large?

Beginner

Answer

Small, focused components are easier to understand at a glance, easier to test in isolation, and easier to reuse in different parts of an app. A very large component that handles too many responsibilities becomes harder to modify safely, since a small change in one part can unexpectedly affect unrelated behavior elsewhere in the same component.
// A large component handling too many unrelated responsibilities
@Component({ selector: 'app-dashboard' })
export class DashboardComponent { /* handles user profile, orders, notifications, and settings */ }

// Broken into smaller, focused components, each with one clear job
<app-user-profile></app-user-profile>
<app-recent-orders></app-recent-orders>
<app-notifications></app-notifications>
Real-world example A team refactors a three hundred line dashboard component into four smaller, focused components, each handling just one section, making the codebase much easier for new team members to understand and safely modify.

Common follow-ups: What is a good rule of thumb for deciding when a component has grown too large?;Does splitting a component always mean creating more files and more complexity?

Components & Templates;Content Projection (ng-content)
All 5 Angular Style Guide & Best Practices questions