Working with Objects

Objects (dw::core::Objects)

This module contains helper functions to work with Objects.

It processes both keys and values as a tuple.

To use this module, you must import it to your DataWeave code, for example, by adding the line import * from dw::core::Objects to the header of your DataWeave script.

We will start with a brief review of filterObject, used to remove key-value pairs from an Object based on some criteria much like filter is used in Arrays.

We’ll then discuss mapObject, which is used to transform every key-value pair into something else.

We’ll also go over pluck, a function that goes from Objects to Arrays and is very useful when combined with the groupBy function we learned on the previous tutorial.

Functions

Name	Description
divideBy	Breaks up an object into sub-objects that contain the specified number of key-value pairs.
entrySet	Returns an array of key-value pairs that describe the key, value, and any attributes in the input object.
everyEntry	Returns `true` if every entry in the object matches the condition.
keySet	Returns an array of key names from an object.
mergeWith	Appends any key-value pairs from a source object to a target object.
nameSet	Returns an array of keys from an object.
someEntry	Returns `true` if at least one entry in the object matches the specified condition.
takeWhile	Selects key-value pairs from the object while the condition is met.
valueSet	Returns an array of the values from key-value pairs in an object.