In data weave, how do you merge two arrays?
DataWeave offers a couple of effective ways to merge two arrays into a single array:
Method 1: Using the Spread Operator (...)
The spread operator (...) allows you to efficiently combine elements from multiple arrays:
%dw 2.0
---
// Sample arrays
var array1 = [1, 2, 3];
var array2 = ["apple", "banana", "cherry"];
// Merge the arrays using spread operator
output = [...array1, ...array2];
Explanation:
The spread operator unpacks the elements of each array within the square brackets.
The result is a single array containing all elements from both array1 and array2.
Method 2: Using the concat Function
The concat function provides another approach for array concatenation:
%dw 2.0
---
// Sample arrays (same as previous example)
output = array1 concat array2;
Explanation:
The concat function takes two arrays as arguments and returns a new array containing the combined elements.
Choosing the Right Method:
Both methods achieve the same outcome.
The spread operator might be considered more concise and readable, especially for simple merges.
The concat function offers a more explicit approach and can be useful when dealing with functions or variables holding the arrays you want to merge.
Additional Considerations:
You can merge more than two arrays by adding them within the square brackets for the spread operator or using multiple arguments with concat.
DataWeave preserves the order of elements during the merge operation.
Example with Duplicates:
If the arrays might contain duplicate elements, both methods will result in a merged array where duplicates are preserved. Here's an example:
%dw 2.0
---
var array1 = [1, 2, 3];
var array2 = [2, 3, 4];
output = [...array1, ...array2]; // output: [1, 2, 3, 2, 3, 4]
Removing Duplicates (Optional):
To create a unique set of elements after merging, you can leverage the distinctBy function:
%dw 2.0
---
output = [...array1, ...array2] distinctBy $; // output: [1, 2, 3, 4]
This approach uses distinctBy $ to remove duplicates based on the element itself ($).
By understanding these methods, you can effectively merge arrays in your DataWeave transformations within MuleSoft applications.
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