Function buildInferredColumns

packages/vuetify/src/labs/VHeatmap/pivot.ts:151–185

(sourceItems: T[], groupKey: string)

    // Start a new column whenever the row key wraps
    function buildInferredColumns (sourceItems: T[], groupKey: string) {
      const columns: PivotColumn<C>[] = []
      const groupItems: C[] = []

      let currentCells: (C | null)[] = Array(rowKeys.length).fill(null)
      let currentItems: C[] = []
      let columnIndex = 0
      let lastRowIndex = -1

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

        if (rowIndex === undefined) continue

        if (rowIndex <= lastRowIndex) {
          columns.push({ key: String(columnIndex), cells: currentCells, items: currentItems })
          columnIndex++
          currentCells = Array(rowKeys.length).fill(null)
          currentItems = []
        }

        const cell = makeCell(item, rowKey, columnIndex, groupKey)
        currentCells[rowIndex] = cell
        currentItems.push(cell)
        groupItems.push(cell)
        lastRowIndex = rowIndex
      }

      if (currentCells.some(c => c !== null)) {
        columns.push({ key: String(columnIndex), cells: currentCells, items: currentItems })
      }

      return { columns, groupItems }
    }

    for (const [groupKey, { label, items: sourceItems }] of groupMap) {
      const { columns, groupItems } = explicit