Читання аргументів командного рядка

JavaScript:
Читання аргументів командного рядка

How to: (Як це зробити:)

Here’s how you snag those command line arguments in Node.js.

// Grab the Node.js process object
const process = require('process');

// Skip the first two elements in the array
const args = process.argv.slice(2);

// Log'em to see what you've got
console.log(args);

// Run this with: node script.js arg1 arg2

Sample Output:

[ 'arg1', 'arg2' ]

Take it up a notch - use a library like yargs for convenient parsing:

const yargs = require('yargs/yargs');
const { hideBin } = require('yargs/helpers');
const argv = yargs(hideBin(process.argv)).argv;

console.log(argv);

// Run this with: node script.js --name=yourname --age=30

Sample Output:

{ name: 'yourname', age: 30 }

Deep Dive (Глибоке Занурення):

Back in the day, command line args were key, even before fancy GUIs. Now, in the JavaScript Node.js world, process.argv is still a solid go-to. Alternatives like yargs or commander simplify things with parsing and validation.

Node.js packs all command-line arguments in process.argv as an array; first two elements are path to the node executable and the script file, hence the .slice(2).

Why use libraries?

They parse options (like --name=yourname into { name: 'yourname' }).
They handle defaults, required arguments, and help messages.
Cleaner, more readable code.

One thing – these tools are for Node.js, not browser JavaScript. For web apps, you’d typically use URL parameters, not command line.

JavaScript:Читання аргументів командного рядка

How to: (Як це зробити:)

Deep Dive (Глибоке Занурення):

See Also (Дивись Також):

JavaScript:
Читання аргументів командного рядка