# All files / utils alphaNumericSort.ts

92% Statements 138/150
50% Branches 2/4
50% Functions 1/2
92% Lines 138/150

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     import type { TextExtractor } from "../types.js";

    const identity = <T>(item: T): string => {
      if (typeof item === "string") {
        return item;
      }

      if (process.env.NODE_ENV !== "production") {
        throw new Error(
          "A `TextExtractor` must be provided to `alphaNumericSort` for lists that do not contain strings"
        );
      }

      return "";
    };

    /**
     * The default `Intl.Collator` that should be used for sorting large lists.
     *
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/localeCompare#performance
     * @remarks \@since 6.0.0
     */
    export const DEFAULT_COLLATOR = new Intl.Collator("en-US", {
      numeric: true,
      caseFirst: "upper",
    });

    /** @remarks \@since 6.0.0 */
    export interface AlphaNumericSortOptions<T> {
      /**
       * The extractor is only required when the list of items are not strings.
       *
       * @example
       * Simple Example
       * ```ts
       * interface Item {
       *   name: string;
       * }
       *
       * const items: Item[] = [{ name: 'Hello' }, { name: 'World' }];
       *
       * `alphaNumericSort(items, {
       *   extractor: item => item.name,
       * })`
       * ```
       *
       * @remarks
       * For javascript developers, this will throw an error in dev mode if an
       * extractor is not provided for non-string lists.
       *
       * @defaultValue `typeof item === "string" ? item : ""`
       */
      extractor?: TextExtractor<T>;

      /**
       * A custom compare function for sorting the list. This should really only be
       * provided if the language for your app is not `"en-US"` or you'd like to
       * provide some custom sorting options.
       *
       * @example
       * Custom Compare using Intl.Collator
       * ```ts
       * const collator = new Intl.Collator("en-US", {
       *   numeric: false,
       *   caseFirst: "lower",
       *   usage: "search",
       * });
       *
       * alphaNumericSort(items, {
       *   compare: collator.compare,
       * })
       * ```
       *
       * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Collator/Collator
       * @defaultValue `new Intl.Collator("en-US", { numeric: true, caseFirst: "upper" }).compare`
       */
      compare?(a: string, b: string): number;

      /**
       * Setting this to `true` will return the list in descending order instead of
       * ascending.
       *
       * @defaultValue `false`
       */
      descending?: boolean;
    }

    /**
     * @example
     * Simple Example
     * ```ts
     * const items = ["World", "Hello"];
     *
     * const sorted = alphaNumericSort(items);
     * // sorted == ["Hello", "World"]
     * ```
     *
     * @param list - The list of strings to sort
     * @returns a new sorted list
     */
    export function alphaNumericSort<T extends string>(
      list: readonly T[],
      options?: Omit<AlphaNumericSortOptions<T>, "extractor">
    ): readonly T[];
    /**
     * @example
     * Simple Example
     * ```ts
     * interface Item {
     *   name: string;
     * }
     *
     * const items: Item[] = [{ name: "World" }, { name: "Hello" }];
     *
     * const sorted = alphaNumericSort(items, {
     *   extractor: item => item.name,
     * });
     * // sorted == [{ name: "Hello" }, { name: "World" }]
     * ```
     *
     * @param list - The list of items to sort
     * @returns a new sorted list
     */
    export function alphaNumericSort<T>(
      list: readonly T[],
      options: AlphaNumericSortOptions<T> & { extractor: TextExtractor<T> }
    ): readonly T[];
    export function alphaNumericSort<T>(
      list: readonly T[],
      options: AlphaNumericSortOptions<T> = {}
    ): readonly T[] {
      const {
        compare = DEFAULT_COLLATOR.compare,
        extractor = identity,
        descending = false,
      } = options;

      const sorted = list.slice();
      sorted.sort((a, b) => {
        const aValue = extractor(a);
        const bValue = extractor(b);

        const value1 = descending ? bValue : aValue;
        const value2 = descending ? aValue : bValue;

        return compare(value1, value2);
      });

      return sorted;
    }