[Solved] What is wrong with this callback implementation?function process(callback) { callback(null, 'done'); callback(null, 'done again'); } process((err, result) => { if (err) console.error(err);... | Node.js

Node.js - Error Handling Patterns

What is wrong with this callback implementation?

function process(callback) {
  callback(null, 'done');
  callback(null, 'done again');
}
process((err, result) => {
  if (err) console.error(err);
  else console.log(result);
});

ACallback parameters are in wrong order

BCallback should not have a null error argument

CCallback is called more than once, which can cause issues

DCallback function is missing error handling

Step-by-Step Solution

Solution:

Step 1: Observe callback calls
The callback is called twice with success results.
Step 2: Understand callback usage rules
Callbacks should be called once to avoid unexpected behavior.
Final Answer:
Callback is called more than once, which can cause issues -> Option C
Quick Check:
Call callbacks only once per operation [OK]

Quick Trick: Never call callback multiple times [OK]

Common Mistakes:

Calling callback multiple times
Ignoring callback invocation count
Assuming multiple calls are safe

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More Node.js Quizzes

What is wrong with this callback implementation?

Step 1: Observe callback calls

Step 2: Understand callback usage rules

Final Answer:

Quick Check:

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