Function orderBy

01.GettingStarted/js/vue.js:9680–9728

* Filter filter for arrays * * @param {String|Array |Function} ...sortKeys * @param {Number} [order]

(arr)

   */

  function orderBy(arr) {
    var comparator = null;
    var sortKeys = undefined;
    arr = convertArray(arr);

    // determine order (last argument)
    var args = toArray(arguments, 1);
    var order = args[args.length - 1];
    if (typeof order === 'number') {
      order = order < 0 ? -1 : 1;
      args = args.length > 1 ? args.slice(0, -1) : args;
    } else {
      order = 1;
    }

    // determine sortKeys & comparator
    var firstArg = args[0];
    if (!firstArg) {
      return arr;
    } else if (typeof firstArg === 'function') {
      // custom comparator
      comparator = function (a, b) {
        return firstArg(a, b) * order;
      };
    } else {
      // string keys. flatten first
      sortKeys = Array.prototype.concat.apply([], args);
      comparator = function (a, b, i) {
        i = i || 0;
        return i >= sortKeys.length - 1 ? baseCompare(a, b, i) : baseCompare(a, b, i) || comparator(a, b, i + 1);
      };
    }

    function baseCompare(a, b, sortKeyIndex) {
      var sortKey = sortKeys[sortKeyIndex];
      if (sortKey) {
        if (sortKey !== '$key') {
          if (isObject(a) && '$value' in a) a = a.$value;
          if (isObject(b) && '$value' in b) b = b.$value;
        }
        a = isObject(a) ? getPath(a, sortKey) : a;
        b = isObject(b) ? getPath(b, sortKey) : b;
      }
      return a === b ? 0 : a > b ? order : -order;
    }

    // sort on a copy to avoid mutating original array
    return arr.slice().sort(comparator);
  }

  /**
   * String contain helper