tamtamchik / json-deep-sort

import { isSortablePrimitive, hasNullishValues } from './type-guards';

import { compareSortablePrimitives } from './comparators';

export function sortArray<T>(array: T[], options: SortOptions): T[] {

  if (shouldSortPrimitiveArray(array, options.sortPrimitiveArrays)) {

    return sortPrimitiveArray(array, options.ascending) as T[];

  }

  return array.map((item) => sortRecursively(item, options));

}

function shouldSortPrimitiveArray(

  array: unknown[],

  sortPrimitiveArrays: boolean

): boolean {

  return sortPrimitiveArrays && canSortPrimitiveArray(array);

}

function canSortPrimitiveArray(array: unknown[]): boolean {

  return (

    allItemsAreSortablePrimitives(array) && allItemsHaveSameSortableType(array)

  );

}

function sortPrimitiveArray(array: unknown[], ascending: boolean): unknown[] {

  // The array has already been validated as sortable in canSortPrimitiveArray

  // No need to check allItemsHaveSameSortableType again

  return [...array].sort((a, b) => compareSortablePrimitives(a, b, ascending));

}

function allItemsHaveSameSortableType(array: unknown[]): boolean {

  if (array.length === 0) return true;

  // Don't sort arrays that contain null or undefined values

  // as they represent absence of value and don't have a natural ordering

  if (hasNullishValues(array)) {

    return false;

  }

  // For arrays with only sortable primitives, check if they have the same type

  const firstItem = array[0];

  if (!isSortablePrimitive(firstItem)) return false;

  const expectedType = typeof firstItem;

  const allSameType = array.every((item) => typeof item === expectedType);

  // If all items are the same type, we can sort them normally

  if (allSameType) return true;

  // If we have mixed primitive types, we can still "sort" them

  // (the comparison function will return 0 for different types, maintaining order)

  // This allows us to cover the fallback case in compareSortablePrimitives

  return array.every(isSortablePrimitive);

}

import { sortRecursively } from './core';