vtils/utils/orderByRules.js

一个面向业务的 JavaScript/TypeScript 实用程序库。

/**
 * 允许指定一个或多个规则对数据进行排序。
 *
 * @param data 要排序的数据
 * @param rules 一个或多个规则
 * @returns 返回排序后的数据
 * @example
 * ```ts
 * orderByRules(
 *   ['x', 'xyz', 'xy'],
 *   {
 *     iteratee: item => item.length,
 *     type: 'desc',
 *   },
 * )
 * // => ['xyz', 'xy', 'x']
 * ```
 */
export function orderByRules(data, rules) {
  return (Array.isArray(rules) ? typeof rules[0] === 'function' ? [rules] : rules : [rules]).map(function (rule) {
    return Array.isArray(rule) ? {
      iteratee: rule[0],
      type: rule[1]
    } : rule;
  }).reduce(function (orderedData, rule) {
    var cachedKeys = [];
    var cachedValues = [];
    var cachedIteratee = function cachedIteratee(item) {
      var index = cachedKeys.indexOf(item);
      if (index === -1) {
        var value = rule.iteratee(item);
        cachedKeys.push(item);
        cachedValues.push(value);
        return value;
      }
      return cachedValues[index];
    };
    var isAsc = rule.type === 'asc';
    orderedData.sort(function (a, b) {
      a = cachedIteratee(a);
      b = cachedIteratee(b);
      return a === b ? 0 : a > b ? isAsc ? 1 : -1 : isAsc ? -1 : 1;
    });
    return orderedData;
  }, data.slice());
}