Here's a compilation of some of the (fairly complex) DW scripts I've done.

Click on a title to see the function's code, input, and output.

The screenshots were generated using the DataWeave Playground. To learn more about this, please read this article: How to run locally the DataWeave Playground Docker Image.

For questions, you can contact me here: www.alexandramartinez.world/contact

Recursive Functions

• getChildren

Tail Recursive Functions

• addIndexTailRecursive
• getDaysBetween
• extractPath
• filterValueByConditions
• extractPathWithFilters

Others

• maskFields
• containsEmptyValues

Creates a tree from a flat array with parent/child relationship.

Keywords: fun, do, var, as, filter, ~=, ==, if/else, isEmpty, match/case, map, $, orderBy, skipNullOn

Input: Array<Object>

Output: Object

Example:

Transforms a JSON payload into a different JSON structure and keeps a count of the indexes accross the whole output array. This function has its own repository that contains additional explanations and links to other resources such as slides and previous versions. To learn more about it please go to this repository: Reviewing a Complex DataWeave Transformation Use-case.

Keywords: dw::util::Values, import, update/with, fun, if/else, do, var, ~=, +, to, default, map, $, ++

Input: Object

Output: Array<Object>

Example:

Count the number of days between two dates using certain filters to either count some days or keep them out.

Filters:

• includeEndDate - Boolean to include the endDate in count or not. Default value is false.
• includingDaysOfWeek - Array of Numbers to include just certain days of the week in count. Default is to count all days of the week (1-7).
• excludingDates - Array of Dates to include certain dates that should not be counted. Default is empty.

Keywords: var, as, fun, do, contains, and, not, if/else, +, >, ==, |P| (Period)

Input: NA

Output: Number

Example:

Extract values from a JSON input using a String representation of a path.

Keywords: dw::core::Strings, import, isNumeric, substringAfter, fun, do, var, scan, regex, isEmpty, if/else, match/case, as

Input: Object, Array

Output: Whichever value was selected from the input and with the path.

Example:

Returns the filtered given value using the conditions passed in an Array of Strings.

Keywords: fun, if/else, isEmpty, do, var, splitBy, filter, ~=, to

Input: Array<Object>

Output: Array<Object>

Example:

Mixing the previous two functions (extractPath and filterValueByConditions) and adding a bit more code to them, this function extracts a specific path and filters the output depending on the given conditions. This also contains an additional function: isArrayOfArray to check if a given value is of the type Array<Array>.

Note: in order to apply the filters successfully, the given key must be from an Array.

Keywords: dw::core::Strings, import, isNumeric, substringAfter, typeOf, ~=, fun, if/else, isEmpty, do, var, splitBy, filter, $, to, scan, match/case, as

Input: Object, Array

Output: Whichever value was selected from the input and with the path.

Example:

Replaces the value with a masked String when the field or the field's attribute contains private information. This function can also be used for different data types, you just need to remove the first condition since it's no longer reading the XML attributes (fieldsToMask contains value.@name).

Keywords: dw::util::Tree, import, mapLeafValues, var, fun, if/else, or, contains, @

Input: Can be anything, but in this example is XML Object

Output: Same as input

Example:

Evaluates if the values from an Array contain at least one empty value (null, [], "", {}). To read more about these 3 different approaches please check out this post: How to check for empty values in an array in DataWeave | Part 4: Arrays Module.

Keywords: dw::core::Arrays, import, some, fun, if/else, isEmpty, $, match/case

Input: Array, Null

Output: Boolean

Example: