Book Image

Learning Azure Functions

By : Mitesh Soni, Manisha Yadav
Book Image

Learning Azure Functions

By: Mitesh Soni, Manisha Yadav

Overview of this book

Functions help you easily run small pieces of code in cloud with Azure functions without worrying about a whole application or the infrastructure to run it. With Azure functions, you can use triggers to execute your code and bindings to simplify the input and output of your code. This book will start with the basics of Azure Functions. You will learn the steps to set up the environment and the tools that we will be using in the further chapters. Once you have a better understanding of this, we will be creating our first hello world function app. Later you will be introduced to triggers, how they are used to activate a function, and how binding can be used to output results of a function.You will also explore the steps to create an assembly with complex functionality that can be used by functions. Next, this book will teach you to scale your functions and use them to process data, integrate systems, and build simple APIs and microservices. Finally, this book will cover some diagnostic techniques with Azure App services and best practices of working with Azure Functions. By the end of this book, you will be well-versed with the techniques of scaling your Azure functions and making the most of serverless architecture.
Table of Contents (17 chapters)
Title Page
About the Authors
About the Reviewers
Customer Feedback

Chapter 4. Bindings

"Hard work beats talent when talent doesn't work hard"

– Tim Notke

The following is a list of some of the ways in which Functions can output their results:

  • Available input and output bindings
  • Event Bus/Service Bus
  • Storage

In simple English, binding is holding things together. In the Azure Function, binding is used to bind other resources of Azure with our Azure Function.

Let's take one example where binding is required in our Azure Function. So, suppose you want to load an external configuration file from blob storage when your function starts. You need to bind the file with the Azure Function. Using binding, you do not need to hardcode anything in your code. You just need to bind the configuration file with the function and take the file from the blob storage when it starts. We can bind not only the input of the function but also the output of the function too.

So, suppose after executing the function we need to store the result in the Azure Table Storage. For that, we need...