Function extractRowKeys

packages/core/src/widgets/table.ts:365–379

(
  data: readonly T[],
  getRowKey: (row: T, index: number) => string,
)

 * @returns Array of row keys
 */
export function extractRowKeys<T>(
  data: readonly T[],
  getRowKey: (row: T, index: number) => string,
): readonly string[] {
  const keys = new Array<string>(data.length);
  for (let i = 0; i < data.length; i++) {
    const row = data[i];
    if (row !== undefined) {
      keys[i] = getRowKey(row, i);
    } else {
      keys[i] = `__empty_${i}`;
    }
  }
  return Object.freeze(keys);
}

/**
 * Build an index map from row keys for O(1) lookups.