Solution:Step 1: Understand constructor parametersThe constructor sets this.code to the passed code value (500).Step 2: Check console.log outputLogging err.code outputs 500 as assigned.Final Answer:500 -> Option DQuick Check:Custom property access = 500 [OK]

[Solved] Consider this code:class AppError extends Error { constructor(message, code) { super(message); this.code = code; } } const err = new AppError('Failed', 500); console.log(err.code); What is the output? | Node.js

Node.js - Error Handling Patterns

Consider this code:

class AppError extends Error { constructor(message, code) { super(message); this.code = code; } } const err = new AppError('Failed', 500); console.log(err.code);

What is the output?

AError

BFailed

Cundefined

D500

Step-by-Step Solution

Solution:

Step 1: Understand constructor parameters
The constructor sets this.code to the passed code value (500).
Step 2: Check console.log output
Logging err.code outputs 500 as assigned.
Final Answer:
500 -> Option D
Quick Check:
Custom property access = 500 [OK]

Quick Trick: Custom properties are accessible on error instances [OK]

Common Mistakes:

Confusing message with code property
Expecting code to be undefined
Assuming code is a built-in Error property

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Consider this code:

Step 1: Understand constructor parameters

Step 2: Check console.log output

Final Answer:

Quick Check:

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