GroupByArrayField

cartographer

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cartographer / groupByArrayField

Function: groupByArrayField()

groupByArrayField(items, fieldKey): Map<string | number | boolean, CatalogItem[]>

Defined in: queries/queryFunctions.ts:385

Group items by array field values (items can belong to multiple groups).

Each value in an array field creates a separate group. Items with multiple values appear in multiple groups.

Parameters

items

CatalogItem[]

Array of items to group

fieldKey

string

Array field key to group by

Returns

Map<string | number | boolean, CatalogItem[]>

• Map of field values to arrays of items containing that value

Example

const byAuthor = groupByArrayField(items, 'authors');
// { 'Lovecraft, H. P.': [item1, item3], 'Smith, Clark Ashton': [item2, item3] }