/nodejs-async-await

Async Exercise #7 - Async Await

The Order System

Task

Please create a file "order.js".

Within that file - Declare the following functions:

  • createCustomer()

  • sendEmail()

  • processPayment()

  • reserveItemsInStock()

All these functions should return a new Promise.

Call the resolve() Method and pass in a message. The message should just state what the function has just done.

Example for processPayment: resolve("Processed the payment successfully").

Now simulate that the task in the promise will take 2 seconds to complete.

Task - Part 2

Now we want to setup a function that processe a complete order, including all subtasks.

Write a function "order". It takes no parameters. Make it an async function using the async keyword.

Within the order function:

  • Call the four order methods in sequence using await
  • Store the result in a variable and output the result

Call your function order() at the bottom.

Now run your script.

You should now see all the order operations in series, each one completing after 2 seconds.

The final output on the terminal should be kind of like this:

Created customer in the database successfully
Sent order confirmation to customer email successfully
Processed customer payment successfully
Reserved the product in stock succesfully

Works? Add, commit and push.

Well done and congrats!

You now have dealt with the most important asynchronous operations in JavaScript.

Now relax and enjoy your synchronous world again :-)