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Understanding Angular Rendering, Re-rendering, and Change Detection for Optimal Performance
- Transitioning from React to Angular or starting with Angular requires understanding its rendering process, change detection, and re-rendering strategy for optimal performance.
- Angular uses real DOM for rendering and checks for changes during its change detection process, unlike React's virtual DOM optimization.
- Angular re-renders components by checking the whole component tree when any data-bound property changes, compared to React's selective re-rendering.
- Angular checks all bindings in a component even if only a small part of the data changes, impacting efficiency compared to React's virtual DOM diffing.
- Optimizations like the OnPush change detection strategy and TrackBy in *ngFor help reduce unnecessary checks in Angular applications.
- OnPush change detection in Angular only triggers updates when relevant changes occur, improving performance in large applications.
- Angular's default change detection verifies the entire component tree for data changes to ensure all bindings are up to date, albeit less efficiently in large apps.
- Directly calling functions in templates can lead to inefficiencies in Angular; using getters or Signals for tracking state is a more efficient approach.
- Strategies to optimize Angular performance include using OnPush change detection, trackBy in *ngFor, avoiding functions in templates, and leveraging Signals for state management.
- By implementing these techniques, developers can enhance Angular app performance, showcasing faster and more efficient user experiences without a virtual DOM.
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