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  5. filterTree

filterTree

filterTree(value: Any, criteria: (value: Any, path: Path) -> Boolean): Any

Filters the value or path of nodes in an input based on a specified criteria.

The function iterates through the nodes in the input. The criteria can apply to the value or path in the input. If the criteria evaluates to true, the node remains in the output. If false, the function filters out the node.

Introduced in DataWeave version 2.4.0.

Parameters

Name Description

value

The value to filter.

criteria

The expression that determines whether to filter the node.

Example

This example shows how filterTree behaves with different inputs. The output is application/dw for demonstration purposes.

Source

%dw 2.0
import * from dw::util::Tree
output application/dw
---
{
    a: {
          name : "",
          lastName @(foo: ""): "Achaval",
          friends @(id: 123): [{id: "", test: true}, {age: 123}, ""]
        } filterTree ((value, path) ->
            value match  {
                            case s is String -> !isEmpty(s)
                            else -> true
                          }
    ),
    b: null filterTree ((value, path) -> value is String),
    c: [
            {name: "Mariano", friends: []},
            {test: [1,2,3]},
            {dw: ""}
        ] filterTree ((value, path) ->
            value match  {
                            case a is Array ->  !isEmpty(a as Array)
                            else -> true
                        })
}

Output

{
  a: {
    lastName: "Achaval",
    friends @(id: 123): [
      {
        test: true
      },
      {
        age: 123
      }
    ]
  },
  b: null,
  c: [
    {
      name: "Mariano"
    },
    {
      test: [
        1,
        2,
        3
      ]
    },
    {
      dw: ""
    }
  ]
}