NestJS - Pipes
You want to create a pipe that both validates if input is a positive integer and transforms it to a number. Which approach correctly combines these tasks?
You want to create a pipe that both validates if input is a positive integer and transforms it to a number. Which approach correctly combines these tasks?
hard📝 component behavior Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand pipe responsibilities
Pipes can both transform and validate input in the transform method.Step 2: Choose approach that combines validation and transformation
In transform(), convert input to number, then throw error if not positive integer correctly does both inside transform(), ensuring input is valid and converted.Final Answer:
In transform(), convert input to number, then throw error if not positive integer -> Option CQuick Check:
Transform and validate together in transform() [OK]
Quick Trick: Validate after transforming input inside transform() [OK]
Common Mistakes:
- Splitting validation and transformation unnecessarily
- Skipping validation for speed
- Putting validation logic outside pipes
Master "Pipes" in NestJS
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