DataWeave 2.1 is compatible with Mule 4.1. Standard Support for Mule 4.1 ended on November 2, 2020, and this version of Mule will reach its End of Life on November 2, 2022, when Extended Support ends.

Deployments of new applications to CloudHub that use this version of Mule are no longer allowed. Only in-place updates to applications are permitted.

MuleSoft recommends that you upgrade to the latest version of Mule 4 that is in Standard Support so that your applications run with the latest fixes and security enhancements.

joinBy(Array<Any>, String): String

Merges a list (array) into a single string value and uses the provided string as a separator between each item in the list.

Note that joinBy performs the opposite task of splitBy.


Name Description


The list (an Array).


A String used to join elements in the list.


This example joins the elements with a hyphen (-).


%dw 2.0
output application/json
"hyphenate" : ["a","b","c"] joinBy "-"


  "hyphenate": "a-b-c"

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