Functions are one of DataWeave’s most important tools. 

You can define your own DataWeave functions using the fun declaration in the header of a DataWeave script. In this section we will cover these topics around functions:

• Named functions
• Lambdas
• Passing functions to other functions
• Calling 2-arity functions with infix notation
• $, $$, $$$ syntax

To define a function in DataWeave use the following syntax:

fun myFunction(param1, param2, ...) = <code to execute>

• The fun keyword starts the definition of a function.
• myFunction is the name you define for the function. Function names must be valid identifiers. For additional details about valid identifiers, see Rules for Declaring Valid Identifiers.
• (param1, param2, …​ , paramn) represents the parameters that your function accepts. You can specify from zero to any number of parameters, separated by commas (,) and enclosed in parentheses.
• The = sign marks the beginning of the code block to execute when the function is called.
• <code to execute> represents the actual code that you define for your function.

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Abdul Quadir