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transform
Last update:
May 18, 2026
Applies a user-defined UDF transformation to each document in the Array. Use this method to clean text, enrich metadata, or filter documents before splitting.
Syntax
docService.transform(documents, transformer)Parameters
Parameter | Type | Required | Description |
|---|---|---|---|
documents | Array | Required | Array of document Structs as returned by load(). |
transformer | UDF / Closure | Required | Function with signature function(required Struct document) that returns a modified document Struct. The function may also return an Array to expand one document into multiple documents. |
Returns
Returns an Array of transformed document Structs.
Example
cleaned = docService.transform(documents, function(required document) {
// Strip extra whitespace and add processing timestamp
document.text = reReplace(document.text, "\s+", " ", "ALL");
document.metadata.processedAt = now();
return document;
});
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