[Solved] What output will this Node.js code produce?const { spawn } = require('child_process');... What output will this Node.js code produce?const { spawn } = require('child_process'); | Node.js

Node.js - Child Processes

What output will this Node.js code produce?

const { spawn } = require('child_process');
const child = spawn('node', ['-e', 'process.exit(10)']);
child.on('exit', (code) => console.log(`Code: ${code}`));

ACode: undefined

BCode: 10

CCode: null

DNo output

Step-by-Step Solution

Solution:

Step 1: Understand process.exit()
The child process explicitly exits with code 10.
Step 2: Listen to 'exit' event
The 'exit' event handler receives the exit code as the first argument.
Final Answer:
Code: 10 is logged, corresponding to Code: 10.
Quick Check:
Exit code passed to listener [OK]

Quick Trick: Exit event provides the exit code as first argument [OK]

Common Mistakes:

Assuming exit code is null or undefined
Not using the exit event properly
Expecting output without a listener

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What output will this Node.js code produce?

Step 1: Understand process.exit()

Step 2: Listen to 'exit' event

Final Answer:

Quick Check:

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