Learning Node.js Development

A complex synchronous program example

Let's go over a slightly more complex example, our second example. As shown in the following code, we start off by defining an add function. The add function takes arguments a and b, adds them together storing that in a variable called total, and returns total. Next, we add up 3 and 8, which is 11, storing it in the res variable. Then, we print out the response using the console.log statement, as shown here:

var add = (a, b) => { var total = a + b;  return total;};var res = add(3, 8);console.log(res);

That's it, nothing synchronous is happening. Once again we just need the Call Stack. The first thing that happens is we execute the main function; this starts the program we have here:

Then we run the first ...