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You have this Angular component code:

medium📝 Debug Q6 of 15
Angular - Change Detection
You have this Angular component code:
constructor(private cd: ChangeDetectorRef) {}

update() {
  this.data = fetchData();
  // missing change detection call
}

What problem might occur here?
AThe data will be fetched twice
BThe app will throw a syntax error
CThe view may not update to show new data
DThe component will reload automatically
Step-by-Step Solution
Solution:
  1. Step 1: Identify missing change detection trigger

    After updating data, change detection must run to update the view.
  2. Step 2: Predict effect of missing detection call

    Without calling detectChanges(), the view may not reflect new data.
  3. Final Answer:

    The view may not update to show new data -> Option C
  4. Quick Check:

    Missing detectChanges() = stale view [OK]
Quick Trick: Call detectChanges() after data updates to refresh view [OK]
Common Mistakes:
MISTAKES
  • Expecting syntax errors from missing call
  • Thinking component reloads automatically
  • Assuming data fetch duplicates

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