@react-native-ohos/flash-list/src/benchmark/useDataMultiplier.ts

FlashList is a more performant FlatList replacement

/**
 * MIT License
 *
 * Copyright (C) 2024 Huawei Device Co., Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/**
 * Increases the data size by duplicating it, it's kept in hook format so that in future we can add auto pagination support.
 * If you're using this with FlatList then make sure you remove `keyExtractor` because this method might duplicate ids that might be in the data.
 * @param data The data to duplicate
 * @param count Final count of data to be returned from this hook
 * @returns Multiplied data.
 */
export function useDataMultiplier<T>(data: T[], count: number): [T[]] {
  const len = data.length;
  const arr = new Array<T>(count);
  let isObject = false;
  if (typeof data[0] === "object") {
    isObject = true;
  }
  for (let i = 0; i < count; i++) {
    arr[i] = isObject ? { ...data[i % len] } : data[i % len];
  }
  return [arr];
}