Learning Node.js Development

Returning the promises

Now what exactly will this look like? To show this, first we'll comment out all of the code we have in the newPromise variable of promise.js. Following this, we'll call the asyncAdd variable where we make asyncAdd. We'll call it like we would any other function, by passing in two values. Remember, this could be a database ID or anything else for an async function. In our case, it's just two numbers. Let's say, 5 and 7. Now the return value from this function is a promise. We can make a variable and call then on that variable, but we can also just tack the then method, as shown here:

asyncAdd(5, 7).then

This is exactly what we'll do when we use promises; we'll tack on then, passing in our callbacks. The first callback ...