You can define your own DataWeave functions using the fun declaration in the header of a DataWeave script.
A match expression contains a list of case statements that can optionally have an else statement. Each case statement consists of a conditional selector expression that must evaluate to either true or false.
A do statement creates a scope in which new variables, functions, annotations, or namespaces can be declared and used.
You can chain several else expressions together within an if-else construct by incorporating else if.
An if statement evaluates a conditional expression and returns the value under the if only if the conditional expression returns true. Otherwise, it returns the expression under else. Every if expression must have a matching else expression.
Flow control is used when you want to execute certain parts of your code in some situations, while not executing others.
A logical operator is a symbol or word used to connect two or more expressions such that the value of the compound expression produced depends only on that of the original expressions and on the meaning of the operator.
We can create a global variable in the header using var directive. We need to give it a name and we can assign either a constant value or a lambda expression. Global variables can be referenced by their name from anywhere in the body of the DataWeave script.
Variables are a way to store values with a given name so they can be later reused from different parts of your code, making the code cleaner and sometimes even more performant as values are calculated once.
An exception occurs when an unexpected event happens while processing. Exception (or error) handling is the process of responding to exceptions when a computer program runs.