Functions as Values
In other words, lambdas become useful when you want to pass functions as arguments to other functions, or return a function from a function.
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Lambdas Function
DataWeave provides multiple ways to create functions. Just like we have named functions, we have functions without names, called lambdas.
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Named Functions
We create functions in the declarations section of the script using the fun keyword. This associates a set of functionality with a name.
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Functions in DataWeave 2.0
You can define your own DataWeave functions using the fun declaration in the header of a DataWeave script.
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Pattern Matching with Literal Values
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.
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do statement in flow control (DataWeave 2.0)
A do statement creates a scope in which new variables, functions, annotations, or namespaces can be declared and used.
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else if Condition in flow (DataWeave 2.0)
You can chain several else expressions together within an if-else construct by incorporating else if.
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if else Condition in Flow Control (DataWeave 2.0)
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.
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Flow Control
Flow control is used when you want to execute certain parts of your code in some situations, while not executing others.
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Logical Operators
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.
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