[Solved] What is wrong with this pipe definition?@Pipe({name: 'double'}) export class DoublePipe implements PipeTransform { transform(value: number): number { value * 2; } } | Angular

Angular - Pipes

What is wrong with this pipe definition?

@Pipe({name: 'double'})
export class DoublePipe implements PipeTransform {
  transform(value: number): number {
    value * 2;
  }
}

AIncorrect pipe name format

Btransform method should accept string, not number

CMissing return statement in transform method

DPipe class should not implement PipeTransform

Step-by-Step Solution

Solution:

Step 1: Review transform method code
The method multiplies value by 2 but does not return the result.
Step 2: Identify missing return
Without return, the pipe returns undefined, causing incorrect output.
Final Answer:
Missing return statement in transform method -> Option C
Quick Check:
transform must return the transformed value [OK]

Quick Trick: Always return value from transform() [OK]

Common Mistakes:

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What is wrong with this pipe definition?