How to wait for function to finish before continuning in Node.js

Question

I am trying to create a route in Node.js/Express that reads data from two queries and then increments a count based on that data from the queires. Since Node.js is asynchro

Answer 1

You can use some library like async.

Here is the code:

var total = 0;
/* GET users listing. */
router.get('/', function(req, res) {
    async.series([
            function(callback){
                increment(2, function(){
                    callback(null, "done");
                });
            },
            function(callback){
                increment(3, function(){
                    callback(null, "done");
                });
            }
        ],
        function(err, result){
            console.log(total);
            res.send('respond the result:' + total);
        });
});

var increment = function(n, callback){
    //Wait for n seconds before incrementing total n times
    setTimeout(function(){
        for(var i = 0; i < n; i++){
            total++;
        }
        callback();
    }, n *1000);
};