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Identify the error in this Angular template snippet:

medium📝 Debug Q14 of 15
Angular - RxJS and Observables Fundamentals
Identify the error in this Angular template snippet:
<div>{{ data | async() }}</div>

Assuming data is an Observable.
AObservable must be converted to Promise first.
BMissing subscription in component code.
CParentheses after async are invalid; async is a pipe, not a function.
DThe variable name should end with $ to use async pipe.
Step-by-Step Solution
Solution:

  1. Step 1: Check async pipe usage

    The async pipe is used without parentheses in templates.

  2. Step 2: Identify syntax error

    Using async() with parentheses is invalid and causes a template error.

  3. Final Answer:

    Parentheses after async are invalid; async is a pipe, not a function. -> Option C

  4. Quick Check:

    Async pipe never uses parentheses = A [OK]
Quick Trick: Async pipe is a pipe, not a function--no parentheses [OK]
Common Mistakes:
MISTAKES
  • Adding parentheses after async pipe
  • Thinking async requires manual subscription
  • Believing variable must have $ suffix

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