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orderBy

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.

orderBy(O, (value: V, key: K) -> R): O

Reorders the elements of an input using criteria that acts on selected elements of that input.

This version of orderBy takes an object as input. Other versions act on an input array or handle a null value.

Note that you can reference the index with the anonymous parameter $$ and the value with $.

Parameters

Name Description

object

The object to reorder.

criteria

The result of the function is used as the criteria to reorder the object.

Example

This example alphabetically orders the values of each object in the input array. Note that orderBy($.letter) produces the same result as orderBy($[0]).

Source

%dw 2.0
output application/json
---
[{ letter: "e" }, { letter: "d" }] orderBy($.letter)

Output

[
  {
    "letter": "d"
  },
  {
    "letter": "e"
  }
]

Example

The orderBy function does not have an option to order in descending order instead of ascending. In these cases, you can simply invert the order of the resulting array using -, for example:

Source

%dw 2.0
output application/json
---
orderDescending: ([3,8,1] orderBy -$)

Output

{ "orderDescending": [8,3,1] }

orderBy(Array<T>, (item: T, index: Number) -> R): Array<T>

Sorts an array using the specified criteria.

Parameters

Name Description

array

The array to sort.

criteria

The result of the function will be used as the criteria to sort the list. It should return a simple value (String, Number, etc)

Example

This example sorts an array of numbers based on the numeric values.

Source

%dw 2.0
output application/json
---
[3,2,3] orderBy $

Output

[ 2, 3, 3 ]

Example

This example sorts an array of people based on their age.

Source

%dw 2.0
output application/json
---
[{name: "Santiago", age: 42},{name: "Leandro", age: 29}, {name: "Mariano", age: 35}] orderBy (person) -> person.age

Output

[
  {
    name: "Leandro",
    age: 29
  },
  {
    name: "Mariano",
    age: 35
  },
  {
    name: "Santiago",
    age: 42
  }
]

orderBy(Null, (item: Nothing, index: Nothing) -> Null): Null

Helper function that allows orderBy to work with null values.