What’s New in DataWeave
DataWeave 2.4 is bundled with Mule 4.4. The 2.4 version of DataWeave introduces the following features:
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Ability to read larger-than-memory strings automatically. When you are using the indexed reader strategy and processing a String with a size larger than 1.5 MB, DataWeave automatically splits the value in chunks to avoid out-of-memory issues. Related reader properties are
com.mulesoft.dw.max_memory_allocationandcom.mulesoft.dw.buffered_char_sequence.enabled. Refer to Indexed Readers in DataWeave. -
New reader and writer properties for working with data formats. For example, the XML writer now enables you to define namespaces at the root level.
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Many new modules, functions, types, annotations, and variables. Some are experimental and subject to change in future releases.
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A number of functions are overloaded to introduce new helper functions for handling
nullvalues.
Changes to the documentation include more detailed function signatures and organization of the functions by their module names, such as dw::Core, dw::core::Strings, and dw::util::Math.
DataWeave 2.4 is bundled with Mule 4.4. For information about the Mule 4.4 release, refer to What’s New in Mule 4.4.
New Properties for Data Formats
DataWeave introduces the following reader and writer properties:
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DataWeave (dw) reader property:
privilegesenables you to provide a comma-separated list of privileges to use in the format, such as'Resources,Properties'. -
Excel (XLSX) reader property:
tableLimitenables you to set position of the last column in each row. -
YAML writer property:
writeDeclarationenables you to write the header declaration. -
XML writer properties:
defaultNamespacespecifies the default namespaces of the output XML , andwriteDeclaredNamespacesmarks the namespaces to declare in the root element of the XML.
New DataWeave Function Modules and Features
New DataWeave modules and features:
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dw::Core introduces new functions and annotations:
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Core Annotations introduces a number of new annotations.
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dw::core::Dates is a new module with functions and types to create and manipulate Date types, for example, the function
today. -
dw::core::Strings introduces new functions:
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dw::util::Coercions is a new DataWeave module with functions and types to simplify data type transformations, for example, the function
toString. -
dw::util::Math is a new DataWeave module with functions and variables that provides mathematical functions, for example, the function
sin. -
dw::util::Periods is a new DataWeave module with functions and types to simplify the creation of Periods, for example, the function
days. -
dw::util::Tree introduces new functions:
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dw::util::Values provides a new type
UpdaterValueProvider.