Friday 1 March 2024

How can you merge two different arrays in Dataweave?94

 How can you merge two different arrays in Dataweave?

Here are two effective ways to merge two different arrays in DataWeave:

1. Concatenation (++ operator):

This method is the simplest and most common approach. Use the concatenation operator (++) to join the two arrays:


%dw 2.0
output application/json

var arr1 = [1, 2, 3];
var arr2 = [4, 5, 6];

var mergedArray = arr1 ++ arr2;

write(mergedArray); // Outputs: [1, 2, 3, 4, 5, 6]

2. map function and concatenation:

This approach offers more flexibility and can be used for selective merging or advanced transformations.


%dw 2.0
output application/json

var arr1 = [1, 2, 3];
var arr2 = [4, 5, 6];

// Apply any desired transformations or filtering within the map function
var mergedArray = arr1 ++ map(arr2, $); // Simply append all elements of arr2

// Or, selectively merge elements based on conditions
var mergedArray = arr1 ++ map(arr2, $ when $. > 4); // Append elements greater than 4

write(mergedArray); // Outputs: [1, 2, 3, 5, 6] (if condition is applied)

Choosing the Right Approach:

  • Simple merging: If you simply want to combine both arrays without modifications, use the concatenation operator (++).

  • Conditional merging or transformations: If you need to selectively merge elements or perform any transformations on the elements while merging, use the map function and concatenation approach.

Additional Considerations:

  • Ensure that the arrays you want to merge have compatible data types.

  • If the arrays contain objects, the merged array will be an array of objects.

  • You can further enhance the map function approach by using expressions, functions, or conditional logic within the map to achieve more complex merging behavior.

By understanding these methods and their nuances, you can effectively merge arrays in DataWeave based on your specific requirements within your MuleSoft 4 applications.

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