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Zip Arrays Together

DataWeave 2.2 is compatible and bundled with Mule 4.2. This version of Mule reached its End of Life on May 2, 2023, when Extended Support ended.

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.

This DataWeave example restructures bills of materials for Ikea-style furniture. The input contains the measurements and amounts of screws in two separate arrays that run in parallel, the transformation reorders them so that the "screws" array is made up of tuples, each with a measurement and its corresponding amount. The same is applied to wooden boards: the input contains two arrays with the x and the y measurements of each; the transformation rearranges them into a series of tuples, one for each board. Before you begin, note that DataWeave version 2 (%dw 2.0) is for Mule 4 apps. For a Mule 3 app, refer to DataWeave 1.0 (%dw 1.0) examples, within the Mule 3.9 documentation set. For other Mule versions, you can use the Mule Runtime version selector in the table of contents.

It uses these DataWeave functions:

  • map to go through the elements in the main array.

  • zip to rearrange pairs of long arrays, so that they’re grouped by index into multiple two-element arrays.

DataWeave
%dw 2.0
output application/json
---
payload map (item, index) ->
{
    name: item.name,
    id: item.itemID,
    screws: zip(item.screws.size, item.screws.quantity),
    measurements: zip(item.measurements.x,item.measurements.y )
}
Input
[
   {
    "name":"wooden-chair",
    "itemID": "23665",
    "screws":{
      "size":[4,6,10],
      "quantity":[15,8,28]
    },
    "measurements":
    {"x":[25,46, 46, 16,150,5, 100, 100, 8],
    "y":[15,4, 4, 80,3, 4, 4, 15]
    }
  },
   {
    "name":"cofee-table",
    "itemID": "14398",
    "screws":{
      "size":[3,8,10],
      "quantity":[8,12,20]
    },
    "measurements":
    {"x":[55, 48, 48, 48, 48, 30, 30, 30, 30],
    "y":[55, 40, 40, 40, 50, 4, 4, 4, 4]
    }
  }
]
Output
[
  {
    "name": "wooden-chair",
    "id": "23665",
    "screws": [
      [4, 15],
      [6, 8],
      [10, 28]
    ],
    "measurements": [
      [25,  15],
      [46, 4],
      [46,  4],
      [16,  80],
      [150,  3],
      [5,  4],
      [100,  4],
      [100,  15]
    ]
  },
  {
    "name": "cofee-table",
    "id": "14398",
    "screws": [
      [3, 8],
      [8, 12],
      [10, 20]
    ],
    "measurements": [
      [55, 55],
      [48, 40 ],
      [48, 40],
      [48, 40],
      [48,50],
      [30, 4],
      [30, 4],
      [30, 4],
      [30, 4]
    ]
  }
]

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