Function buildExplicitColumns

packages/vuetify/src/labs/VHeatmap/pivot.ts:119–148

(sourceItems: T[], groupKey: string)

    }

    function buildExplicitColumns (sourceItems: T[], groupKey: string) {
      const groupItems: C[] = []

      const columnKeys = columnsProp
        ? [...columnsProp]
        : [...new Set(sourceItems.map(item => getPropertyFromItem(item, itemColumn)))]

      const columns: PivotColumn<C>[] = columnKeys.map(key => ({
        key: String(key),
        cells: Array(rowKeys.length).fill(null),
        items: [],
      }))
      const columnIndexByKey = new Map<any, number>(columnKeys.map((k, i) => [k, i]))

      for (const item of sourceItems) {
        const rowKey = getPropertyFromItem(item, itemRow)
        const columnKey = getPropertyFromItem(item, itemColumn)
        const rowIndex = rowIndexByKey.get(rowKey)
        const columnIndex = columnIndexByKey.get(columnKey)

        if (rowIndex === undefined || columnIndex === undefined) continue

        const cell = makeCell(item, rowKey, columnKey, groupKey)
        columns[columnIndex].cells[rowIndex] = cell
        columns[columnIndex].items.push(cell)
        groupItems.push(cell)
      }

      return { columns, groupItems }
    }

    // Start a new column whenever the row key wraps
    function buildInferredColumns (sourceItems: T[], groupKey: string) {