Method #buildColumnCache

handsontable/src/dataMap/dataMap.ts:182–217

* Builds the column property cache from the `columns` setting. * * @param {Function|Array} columns The columns setting value. * @param {unknown} schema The current data schema.

(
    columns: ((column: number) => Record<string, unknown>) | Record<string, unknown>[],
    schema: unknown
  )

   * @param {unknown} schema The current data schema.
   */
  #buildColumnCache(
    columns: ((column: number) => Record<string, unknown>) | Record<string, unknown>[],
    schema: unknown
  ) {
    let columnsLen = 0;
    let filteredIndex = 0;
    const isColumnsFn = typeof columns === 'function';

    if (isColumnsFn) {
      const schemaLen = deepObjectSize(schema);

      columnsLen = schemaLen > 0 ? schemaLen : this.countFirstRowKeys();

    } else {
      const maxCols = this.tableMeta.maxCols;

      columnsLen = Math.min(maxCols ?? Infinity, columns.length);
    }

    for (let i = 0; i < columnsLen; i++) {
      const column = isColumnsFn
        ? (columns as (index: number) => Record<string, unknown>)(i) : columns[i];

      if (isObject(column)) {
        if (typeof column.data !== 'undefined') {
          const index = isColumnsFn ? filteredIndex : i;
          const columnData = column.data as string | number;

          this.colToPropCache[index] = columnData;
          this.propToColCache!.set(columnData, index);
        }

        filteredIndex += 1;
      }
    }
  }

  /**
   * Get the amount of physical columns in the first data row.