lastIndexOf

lastIndexOf(array: Array, value: Any): Number

Returns the index of the last occurrence of the specified element in a given array or -1 if the array does not contain the element.

Introduced in DataWeave version 2.4.0.

Parameters

Name Description

Name	Description
`array`	The array of elements to search.
`value`	The value to search.

array

The array of elements to search.

value

The value to search.

Example

This example shows how indexOf behaves given different inputs.

Source

%dw 2.0
output application/json
---
{
  present: ["a","b","c","d"] lastIndexOf "c",
  notPresent: ["x","w","x"] lastIndexOf "c",
  presentMoreThanOnce: ["a","b","c","c"] lastIndexOf "c",
}

Output

{
  "present": 2,
  "notPresent": -1,
  "presentMoreThanOnce": 3
}

lastIndexOf(array: String, value: String): Number

Takes a string as input and returns the index of the last occurrence of a given search string within the input. The function returns -1 if the search string is not present in the input.

Introduced in DataWeave version 2.4.0.

Parameters

Name Description

Name	Description
`string`	The string to search.
`value`	A string value to search for within the input string.

string

The string to search.

value

A string value to search for within the input string.

Example

This example shows how the indexOf behaves given different inputs.

Source

%dw 2.0
output application/json
---
{
  present: "abcd" lastIndexOf "c",
  notPresent: "xyz" lastIndexOf "c",
  presentMoreThanOnce: "abcdc" lastIndexOf "c",
}

Output

{
  "present": 2,
  "notPresent": -1,
  "presentMoreThanOnce": 4
}

lastIndexOf(array: Null, value: Any): Number

Helper function that enables lastIndexOf to work with a null value.

Introduced in DataWeave version 2.4.0.