typed-utilities/build/sortByProperty.js

Strongly typed general purpose utilities

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.sortByProperty = void 0;
// "sortByProperty" is memoized; instead of creating a new function each time it is called.
// However inner functions (returned by sortBy) are not.
const sortByPropertyFnCache = {}; // Example usage: [{ x: "b" }, { x: "a" }].sort(sortBy("x")) is [{ x: "a" }, { x: "b" }]

const sortByProperty = (...keys) => {
  const cacheIndex = JSON.stringify(keys);

  if (!sortByPropertyFnCache[cacheIndex]) {
    sortByPropertyFnCache[cacheIndex] = (a, b) => {
      if (keys.length === 0) {
        return 0;
      }

      const [key, ...rest] = keys;
      const ak = a[key];
      const bk = b[key];

      if (typeof ak !== `string` && typeof bk !== `string`) {
        return 0;
      }

      if (typeof ak !== `string`) {
        return -1;
      }

      if (typeof bk !== `string`) {
        return 1;
      }

      const value = ak.localeCompare(bk);

      if (value !== 0) {
        return value;
      }

      return sortByProperty(...rest)(a, b);
    };
  }

  return sortByPropertyFnCache[cacheIndex];
};

exports.sortByProperty = sortByProperty;
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