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updatearray() Function

Tip:  Check out the new array function, a!update(). It does everything updatearray() does but with support for more data types like maps, CDTs, records, and dictionaries.


updatearray( array, index, value )

Inserts new values or modifies existing values at the specified index of a given array, and returns the resulting array.

See also:

  • Inserting a Value into an Index of an Array: If you plan to use this function on a node output and simply want to insert one or more values into an array, check out the Is Stored at Index operator discussed in this help topic which provides this specific functionality.
  • insert(): Use this function if you want to insert new values into a list without replacing existing values.
  • append(): Use this function if you want to append values to the end of a list.


Keyword Type Description


Any Type Array

The array to modify.


Integer or Integer Array

The one-based index or array of indices at which to update the array.


Any Type or Any Type Array

The new value or values to add or replace existing values.


Any Type Array

Usage considerations

Using simple and complex data

This function works with complex data types structures in the same way as simple structures. For example, assume you have a Case data type with a notes field that represents a list of Notes. When an array of cases is passed in as the input array, an array of cases returns. When an array of cases.notes is passed in, an array of notes returns.

Using the index parameter

The index value must be greater than or equal to 1.

If the index is null, or an empty list, the input array is returned with no changes.

Understanding error messages

Common error messages and reasons are listed below:

Runtime error message Reason
The list of indices and list of new values must be of equal length. The list of indices has <value> items. The list of new values has <value> items. Unless the new value is null, the list of indices must match the list of new values.
Cannot cast from type <newValueType> to type <inputType> The type of the new value cannot be cast to the input array type.
The indices are not of the expected type. Type of indices: <type passed in>. Type expected: <type expected>. The index is not a number (e.g., a list of nulls, or a string).
An array is expected as the first parameter. The input array is a single value (not an array). For example: updatearray(1, 1, 200) returns an error.
An invalid index is present (<index>). Indices must be greater or equal to one. The index is less than or equal to zero. For example: updatearray({1, 2, 3}, 0, 200) returns an error.


Update one item in the array

updatearray({1, 2, 3}, 2, 200) returns 1, 200, 3

Update multiple items in the array

updatearray({1, 2, 3}, {2, 3}, {200, 300}) returns 1, 200, 300

Update multiple items in the array with the same value

updatearray({1, 2, 3}, {2, 3}, 300) returns 1, 300, 300

Update one or more items with values of a different type

updatearray({1, 2, 3}, 2, "20") returns 1, 20, 3

Append one or more items to an array

updatearray({1, 2, 3}, 5, 500) returns 1, 2, 3, null, 500

updatearray({1, 2, 3}, {1, 5}, {100, 500}) returns 100, 2, 3, null, 500

Null out one or more items in an array

updatearray({1, 2, 3}, 2, pv!Multiple[2]) returns 1, null, 3 where pv!Multiple[2] has a null value

updatearray({1, 2, 3}, {2, 3}, pv!Multiple[2]) returns 1, null, null where pv!Multiple[2] has a null value

updatearray({1, 2, 3}, {4, 5}, pv!Multiple[2]) returns 1, 2, 3, null, null where pv!Multiple[2] has a null value

Update a null array

updatearray({tointeger(null)}, 2, 200) returns null, 200

Update an empty array

updatearray({}, {2, 3}, 3) returns null, 3, 3

Feature compatibility

The table below lists this function's compatibility with various features in Appian.
Feature Compatibility Note
Portals Compatible
Offline Mobile Compatible
Custom Record Field Expressions Compatible
Process Reports Compatible
Process Events Compatible
Open in Github Built: Thu, May 23, 2024 (08:46:51 PM)

updatearray() Function