Thursday 14 March 2024

How to sort an array? in MuleSoft 134

 How to sort an array? in MuleSoft

Here's how to sort an array in MuleSoft 4:

Method 1: Using DataWeave:

DataWeave offers a convenient and efficient way to sort arrays. Here's how to achieve this:

%dw 2.0
// Sample array
var data = [4, 2, 1, 5, 3];

// Sort the array in ascending order
output = data orderBy #[it];  // #[it] refers to the current element

// For descending order (optional)
output = data orderBy #[it] descending;


  1. Define a sample array (data).

  2. The orderBy function reorders the elements of the array based on the specified criteria.

  3. #[it] refers to the current element within the array during the sorting process.

  4. By default, the sorting happens in ascending order.

  5. To achieve descending order, add the keyword descending after the criteria.

Method 2: Using MEL (Message Expression Language):

MEL provides a basic approach for sorting using a custom function. Here's an example:


    function sortAscending(arr) {
      return arr.sort((a, b) => a - b);
    // Optional function for descending order
    function sortDescending(arr) {
      return arr.sort((a, b) => b - a);
    write(sortAscending(payload), application/json);  // Call the desired function


  1. A Scripting component is used to define custom JavaScript functions.

  2. The sortAscending function takes an array as input and uses the sort method with a comparison function.

  3. The comparison function (a - b) sorts elements in ascending order by comparing their values.

  4. An optional sortDescending function demonstrates achieving descending order by reversing the comparison logic.

  5. The sorted array is written to the output stream using the desired function (e.g., sortAscending).

Choosing the Right Approach:

  • DataWeave: This is the recommended method due to its:

  • Readability

  • Concise syntax

  • Ability to handle complex sorting scenarios (sorting based on multiple criteria, nested objects)

  • MEL: While functional for simple sorting, MEL expressions can become complex for intricate sorting logic or conditional operations.

Additional Considerations:

  • Ensure the payload is a valid array before applying these methods.

  • Error handling can be incorporated within DataWeave or the custom MEL function to gracefully handle cases where the payload might not be in the expected format.

Further Considerations:

  • DataWeave also offers the ability to sort based on specific properties within objects contained in the array.

  • You can leverage expressions and conditions within the orderBy function for more granular control over the sorting behavior.

Here are some helpful resources for further reference:



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