infomaven/JS-questions.txt

## JS-questions.txt
What is the difference between "express": "^4.13.3" and "express": "~4.13.3" ?

What happens if I use `npm install <package> --save` instead of `npm install <package> --save-dev` ?

## server.js
var http = require('http');
var hostname = 'localhost';
var port = 3000;

var server = http.createServer( function(req, res) {
  console.log( req.headers);
    res.writeHead( 200, { 'Content-Type': 'text/html' });
  res.end( '<html><body><h1>Hello World</h1></body></html>');
  })

  server.listen( port, hostname, function() {
  /* TQ: what will each of these lines yield as output?  */
    console.log( `Server running at http://${hostname}:${port}/`);
        console.log( 'Server running at http://${hostname}:${port}/');
          console.log( "Server running at http://${hostname}:${port}/");

  });
	What is the difference between "express": "^4.13.3" and "express": "~4.13.3" ?

	What happens if I use `npm install <package> --save` instead of `npm install <package> --save-dev` ?
	var http = require('http');
	var hostname = 'localhost';
	var port = 3000;

	var server = http.createServer( function(req, res) {
	console.log( req.headers);
	res.writeHead( 200, { 'Content-Type': 'text/html' });
	res.end( '<html><body><h1>Hello World</h1></body></html>');
	})

	server.listen( port, hostname, function() {
	/* TQ: what will each of these lines yield as output? */
	console.log( `Server running at http://${hostname}:${port}/`);
	console.log( 'Server running at http://${hostname}:${port}/');
	console.log( "Server running at http://${hostname}:${port}/");

	});