_node-js-basics-command-line-argument.md

Code Examples for my Blog Post: Node.js Basics – Command-Line Arguments

example-1-A.js

console.dir(process.argv);

example-1-B.js

node showArgs-1.js

example-1-C.js

[
  'node',
  '/[PATH TO]/showArgs-1.js'
]

example-2-A.js

console.dir(process.argv);

example-2-B.js

node showArgs-1.js arg2 arg3 arg4

example-2-C.js

[
  'node',
  '/[PATH TO]/showArgs-1.js',
  arg2,
  arg3,
  arg4
]

example-3-A.js

//omit the first two argument (node and the path to showArgs-2.js)
var args = process.argv.slice(2);

//inspect the arguments
console.dir(args);

example-3-B.js

node showArgs-2.js arg0 arg1 arg2

example-3-C.js

[ 'arg0', 'arg1', 'arg2' ]

example-4-A.js

//omit the first two argument (node and the path to showArgs-3.js)
var args = process.argv.slice(2);

//inspect the arguments
args.forEach(function(val, index, array) {
  console.log('Argument # ' + index + ': ' + val);
});

example-4-B.js

node showArgs-3.js arg0 arg1 arg2

example-4-C.js

Argument # 0: arg0
Argument # 1: arg1
Argument # 2: arg2