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What is the main role of Zone.js in Angular?

easy🧠 Conceptual Q11 of 15
Angular - Change Detection
What is the main role of Zone.js in Angular?
AIt compiles TypeScript to JavaScript.
BIt manages routing between pages.
CIt styles components with CSS.
DIt automatically detects async tasks and triggers UI updates.
Step-by-Step Solution
Solution:

  1. Step 1: Understand Zone.js purpose

    Zone.js tracks asynchronous operations like timers and events.

  2. Step 2: Connect to Angular UI updates

    When async tasks finish, Zone.js tells Angular to update the screen automatically.

  3. Final Answer:

    It automatically detects async tasks and triggers UI updates. -> Option D

  4. Quick Check:

    Zone.js auto-detects async tasks = A [OK]
Quick Trick: Zone.js watches async tasks to update UI automatically [OK]
Common Mistakes:
MISTAKES
  • Confusing Zone.js with routing or styling
  • Thinking Zone.js compiles code
  • Assuming manual UI updates are needed

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