To create a function in DataWeave, you can follow these steps:
Start by defining the function using the fun keyword, followed by the function name and parameter list in parentheses. For example:
fun calculateTax(amount: Number, rate: Number) = ...
Inside the function, define the logic for what the function should do with the given input parameters. For example:
fun calculateTax(amount: Number, rate: Number) = amount * rate
Save the function as a reusable module by wrapping it in a module declaration. For example:
fun calculateTax(amount: Number, rate: Number) = amount * rate // Define module module MyFunctions = { // Export function calculateTax: calculateTax }
You can then import the module and use the function in your DataWeave script. For example:
// Import module import MyFunctions// Use function {"amount": 100,"rate": 0.2,"tax": MyFunctions::calculateTax($.amount, $.rate)}
In this example, the calculateTax function is defined and exported in the MyFunctions module. The module is then imported and the function is used to calculate the tax on a given amount at a given rate.
Note that this is just a basic example, and you can create more complex functions that perform a variety of operations on data in DataWeave.