react-native-full-calendars/lib/module/calendar/utils/computed-array-merge.js

React Native Full Calendar (RNFC) is an intuitive and powerful calendar component library designed for React Native.

"use strict";

export const alignDataList = (prevList, currentList) => {
  // Create a map from currentList for quick lookup
  const currentMap = currentList.reduce((map, item) => {
    map[item.id] = item;
    return map;
  }, {});

  // Create the result array based on prevList order
  const alignedList = prevList.map(prevItem => {
    if (!prevItem) {
      return null;
    }
    if (!prevItem.metadata?.isEnd && currentMap[prevItem.id]) {
      return currentMap[prevItem.id];
    }
    return null;
  });
  const cleanedArray = removeTrailingNulls(alignedList);

  // Find items in currentList that are not in prevList
  const prevIds = new Set(prevList.filter(item => item).map(item => item.id));
  const additionalItems = currentList.filter(item => !prevIds.has(item.id));
  return fillNullsWithItems(cleanedArray, additionalItems);
};
const fillNullsWithItems = (array, items) => {
  let itemIndex = 0; // To keep track of items to insert

  const filledArray = array.map(element => {
    if (element === null && itemIndex < items.length) {
      const itemToInsert = items[itemIndex];
      itemIndex += 1;
      return itemToInsert;
    }
    return element;
  });
  // Append any remaining items
  const remainingItems = items.slice(itemIndex);
  return filledArray.concat(remainingItems);
};
const removeTrailingNulls = array => {
  let i = array.length - 1;
  while (i >= 0 && array[i] === null) {
    i--;
  }
  return array.slice(0, i + 1);
};
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