@cn-ui/table-core/src/utils/getFacetedUniqueValues.ts

Headless UI for building powerful tables & datagrids for TS/JS.

import { Table, RowData } from '../types'
import { getMemoOptions, memo } from '../utils'

export function getFacetedUniqueValues<TData extends RowData>(): (
  table: Table<TData>,
  columnId: string
) => () => Map<any, number> {
  return (table, columnId) =>
    memo(
      () => [table.getColumn(columnId)?.getFacetedRowModel()],
      facetedRowModel => {
        if (!facetedRowModel) return new Map()

        let facetedUniqueValues = new Map<any, number>()

        for (let i = 0; i < facetedRowModel.flatRows.length; i++) {
          const values =
            facetedRowModel.flatRows[i]!.getUniqueValues<number>(columnId)

          for (let j = 0; j < values.length; j++) {
            const value = values[j]!

            if (facetedUniqueValues.has(value)) {
              facetedUniqueValues.set(
                value,
                (facetedUniqueValues.get(value) ?? 0) + 1
              )
            } else {
              facetedUniqueValues.set(value, 1)
            }
          }
        }

        return facetedUniqueValues
      },
      getMemoOptions(
        table.options,
        'debugTable',
        `getFacetedUniqueValues_${columnId}`
      )
    )
}