process.exit and exit codes in Node.js - Mini Project: Build & Apply

Using process.exit and Exit Codes in Node.js

📖 Scenario: You are creating a simple Node.js script that checks if a user is authorized to access a system. If the user is authorized, the script will exit with a success code. If not, it will exit with an error code.

🎯 Goal: Build a Node.js script that uses process.exit with different exit codes to indicate success or failure.

📋 What You'll Learn

Create a variable named isAuthorized with the value true or false.

Create a variable named exitCode to hold the exit code number.

Use an if statement to set exitCode to 0 if isAuthorized is true, otherwise set it to 1.

Call process.exit(exitCode) to end the program with the correct exit code.

💡 Why This Matters

🌍 Real World

Many command-line tools and scripts use exit codes to tell other programs if they worked or failed.

💼 Career

Understanding process.exit and exit codes is important for writing reliable Node.js scripts and tools that integrate well with other software.

1

Set up the authorization variable

Create a variable called isAuthorized and set it to false.

Node.js

// Create a variable called isAuthorized and set it to false
// Your code here

Need a hint?

Use const isAuthorized = false; to create the variable.

2

Create the exit code variable

Create a variable called exitCode and set it to 0 as a starting value.

Node.js

const isAuthorized = false;
// Create a variable called exitCode and set it to 0
// Your code here

Need a hint?

Use let exitCode = 0; to create the variable.

3

Set exit code based on authorization

Use an if statement to check if isAuthorized is true. If yes, set exitCode to 0. Otherwise, set exitCode to 1.

Node.js

const isAuthorized = false;
let exitCode = 0;
// Use if statement to set exitCode to 0 if isAuthorized is true, else 1
// Your code here

Need a hint?

Use if (isAuthorized) { exitCode = 0; } else { exitCode = 1; }.

4

Exit the process with the exit code

Call process.exit(exitCode) to end the program with the correct exit code.

Node.js

const isAuthorized = false;
let exitCode = 0;
if (isAuthorized) {
    exitCode = 0;
} else {
    exitCode = 1;
}
// Call process.exit with exitCode
// Your code here

Need a hint?

Use process.exit(exitCode); to exit the program.