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Consider this Angular component snippet:

medium📝 component behavior Q13 of 15
Angular - Change Detection
Consider this Angular component snippet:
export function Counter() {
  const [count, setCount] = useState(0);
  function increment() {
    setCount(count + 1);
  }
  return ``;
}

What happens if increment() is called but Angular's change detection does not run?
AThe button label stays the same and does not show the updated count.
BAngular throws a runtime error.
CThe button label updates immediately to show the new count.
DThe component reloads completely.
Step-by-Step Solution
Solution:
  1. Step 1: Understand change detection role in UI update

    Change detection updates the screen to reflect data changes like count.
  2. Step 2: Analyze effect of no change detection

    If change detection does not run, the UI does not refresh, so the button label stays the same.
  3. Final Answer:

    The button label stays the same and does not show the updated count. -> Option A
  4. Quick Check:

    No change detection = no UI update [OK]
Quick Trick: Without change detection, UI won't reflect data changes [OK]
Common Mistakes:
MISTAKES
  • Assuming UI updates automatically without change detection
  • Expecting a runtime error
  • Thinking component reloads fully

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