Angular - Pipes
You have an Angular pipe declared as pure: false but it does not update when input changes. What is a likely cause?
You have an Angular pipe declared as pure: false but it does not update when input changes. What is a likely cause?
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Understand impure pipe behavior
Impure pipes run every cycle, so input reference changes are not required.Step 2: Analyze why pipe might not update
If pipe relies on reference but input never changes, output may appear stale despite impure setting.Final Answer:
The input reference never changes and pipe relies on reference check. -> Option BQuick Check:
Impure pipes update every cycle, but input reference matters for output [OK]
Quick Trick: Impure pipes run every cycle but input changes affect output [OK]
Common Mistakes:
- Assuming pure: false always forces update regardless of input
- Forgetting to declare pipe in module declarations
- Confusing missing transform method with update issues
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