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What is the main purpose of a computed signal in Angular's signal system?

easy📝 Conceptual Q11 of 15
Angular - Signals
What is the main purpose of a computed signal in Angular's signal system?
ATo replace all signals with a single global state
BTo store static data that never changes
CTo automatically update a value based on other signals when they change
DTo manually trigger UI updates
Step-by-Step Solution
Solution:
  1. Step 1: Understand what computed signals do

    Computed signals derive their value from other signals and update automatically when those signals change.
  2. Step 2: Compare options with this behavior

    Only To automatically update a value based on other signals when they change describes automatic updates based on dependencies, which matches computed signals.
  3. Final Answer:

    To automatically update a value based on other signals when they change -> Option C
  4. Quick Check:

    Computed signals = auto-update derived values [OK]
Quick Trick: Computed signals auto-update when dependencies change [OK]
Common Mistakes:
  • Thinking computed signals store static data
  • Confusing manual updates with automatic updates
  • Assuming computed signals replace all signals

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