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Consider this Angular component using the default change detection strategy:

medium📝 component behavior Q13 of 15
Angular - Change Detection
Consider this Angular component using the default change detection strategy:
@Component({
  selector: 'app-counter',
  template: ``
})
export class CounterComponent {
  count = 0;
  increment() {
    this.count++;
  }
}

What will happen when the button is clicked?
AAn error will occur because change detection is disabled
BThe displayed count will not change until manually refreshed
CThe count will increase but the view will not update
DThe displayed count will increase by 1 automatically
Step-by-Step Solution
Solution:
  1. Step 1: Understand default change detection behavior on event

    Default strategy runs change detection automatically after events like button clicks.
  2. Step 2: Predict view update

    When increment() updates count, the view updates automatically to show the new count.
  3. Final Answer:

    The displayed count will increase by 1 automatically -> Option D
  4. Quick Check:

    Default strategy updates view on event [OK]
Quick Trick: Default strategy updates view after events automatically [OK]
Common Mistakes:
MISTAKES
  • Thinking manual refresh is needed
  • Assuming change detection is off
  • Believing count changes but view stays same

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