Method _getRenderRowsForData

src/cdk/table/table.ts:1093–1110

* Gets a list of `RenderRow ` for the provided data object and any `CdkRowDef` objects that * should be rendered for this data. Reuses the cached RenderRow objects if they match the same * `(T, CdkRowDef)` pair.

(
    data: T,
    dataIndex: number,
    cache?: WeakMap<CdkRowDef<T>, RenderRow<T>[]>,
  )

   * `(T, CdkRowDef)` pair.
   */
  private _getRenderRowsForData(
    data: T,
    dataIndex: number,
    cache?: WeakMap<CdkRowDef<T>, RenderRow<T>[]>,
  ): RenderRow<T>[] {
    const rowDefs = this._getRowDefs(data, dataIndex);

    return rowDefs.map(rowDef => {
      const cachedRenderRows = cache && cache.has(rowDef) ? cache.get(rowDef)! : [];
      if (cachedRenderRows.length) {
        const dataRow = cachedRenderRows.shift()!;
        dataRow.dataIndex = dataIndex;
        return dataRow;
      } else {
        return {data, rowDef, dataIndex};
      }
    });
  }

  /** Update the map containing the content's column definitions. */
  private _cacheColumnDefs() {