joepie91/_note.md

## _note.md

      
        

                Raw

        
        
          
            
          
          
            
              _note.md
            
          
        
      
      
    This is an extremely simple example of how you have 'persistent state' when writing an application in Node.js. The i variable is shared across all requests, so every time the /increment route is accessed, the number is incremented and returned.
This may seem obvious, but it works quite differently from eg. PHP, where each HTTP request is effectively a 'clean slate', and you don't have persistent state. Were this written in PHP, then every request would have returned 1, rather than an incrementing number.

  

  

## example.js
var i = 0;

// [...]

app.get("/increment", function(req, res) {
      i += 1;
      res.send("Current number: " + i);
})

// [...]
	var i = 0;

	// [...]

	app.get("/increment", function(req, res) {
	i += 1;
	res.send("Current number: " + i);
	})

	// [...]