How does Azure Functions input binding work in the 4.x version?

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Azure Functions input binding is a feature that allows functions to receive data from external sources without needing to write code to retrieve it. In version 4.x of Azure Functions, input binding works by using the concept of triggers.

A trigger is a type of input binding that is automatically executed when a specific event occurs, such as the arrival of a message in a queue or the creation of a new file in a storage account. When a trigger is activated, it passes data to the function as an input parameter.

To use input binding in Azure Functions 4.x, you need to define the type of input binding you want to use and its configuration settings in the function's configuration file (function.json). You can configure multiple triggers for a single function or multiple functions in a single host, depending on your needs.

Once you have configured the input binding, Azure Functions will automatically bind the input data to the function parameter based on the data type defined in the function signature. The function can then process the data and return the desired output.

Overall, input binding simplifies the process of integrating external data sources with Azure Functions, allowing developers to focus on writing business logic instead of boilerplate code.