Learning Node.js Development

Creating the asyncAdd function using the setTimeout object

To kick things off, we'll make a fake async function using setTimeout to simulate a delay inside utils.js. Just below where we make our add function, let's make one called asyncAdd. It'll essentially have the same features, but it'll use setTimeout and it'll have a callback to simulate a delay. Now in the real world, this delay might be a database request or an HTTP request. We'll be dealing with that in the following chapters. For now though, let's add module.exports.asyncAdd:

module.exports.add = (a, b) => a + b;module.exports.asyncAdd = ()

This will take three arguments, as opposed to the two the add function took, a, b, and callback:

module.exports.add = (a, b) => a + b;module.exports.asyncAdd ...