OnPush Change Detection
OnPush Change Detection: free step-by-step lesson with examples, common mistakes, and interview tips — part of Angular Tutorial on Toolliyo Academy.
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Angular Tutorial · Lesson 64 of 100
OnPush Change Detection
Setup & Components ✓ → Routing HTTP Rx ✓ → State & Perf → Ship & Projects
State & Perf · 3 — Scale · ~10 min · UI and Performance
What is this?
OnPush Change Detection improves UI polish or runtime performance.
Why should you care?
Enterprise lists feel slow without OnPush, trackBy, and budgets.
See it live — copy this example
Run examples in an Angular CLI project (ng serve). Prefer standalone components and TypeScript strict mode.
changeDetection: ChangeDetectionStrategy.OnPush
// OnPush Change DetectionWhat happened?
- Measure first; apply the smallest performance win that fits.
- Follow the steps below — typing the code yourself is the fastest way to learn.
Practice next
- Reproduce the snippet in an Angular CLI app.
- Change one binding or route and re-serve.
- Note one mistake you almost made.
- Extract a service.
- Add a trivial unit test later.
Remember
You can explain OnPush Change Detection simply. You ran a small Angular demo. You know one pitfall.
OnPush Change Detection in AngularVerse
Your team applies onpush change detection on an admin UI.
Outcome: A concrete next coding step exists.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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