UnwindOptions.includeArrayIndex property

Optional: Include array index in output.

Adds a field with the array element's position (zero-based index). The field name is specified by this option.

Signature:

includeArrayIndex?: string;

Example

{
    includeArrayIndex: 'memberIndex';
}
// Adds field 'memberIndex' with values 0, 1, 2, ...

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unwind() function

UnwindOptions interface