Deeply iterate in objects with Lodash

deeply-airbnb.js

_.mixin({
  deeply: map =>
    (obj, fn) =>
      map(_.mapValues(obj, (v) => {
        if (_.isPlainObject(v)) {
          return _.deeply(map)(v, fn);
        } else if (_.isArray(v)) {
          return _.map(v, item => _.deeply(map)(item, fn));
        }
        return v;
      }), fn),
});

deeply.js

_.mixin({
  deeply: function(map) {
    return function(obj, fn) {
      return map(_.mapValues(obj, function(v) {
        if (_.isPlainObject(v)) {
          return _.deeply(map)(v, fn);
        } else if (_.isArray(v)) {
          return _.map(v, item => _.deeply(map)(item, fn));
        }
        return v;
      }), fn);
    }
  },
});

line 8 (on both) should be return v.map((item) => deeply(map)(item, fn))

This incorrectly converts Arrays from [0, 1, 2] into { '0': undefined, '1': undefined, '2': undefined }

Final working version:

// <https://stackoverflow.com/a/41978063>
_.mixin({
  deeply(map) {
    // <https://stackoverflow.com/a/48032359>
    const deeplyArray = function (obj, fn) {
      return obj.map(function (x) {
        return _.isPlainObject(x) ? _.deeply(map)(x, fn) : x;
      });
    };

    return function (obj, fn) {
      if (_.isArray(obj)) return deeplyArray(obj, fn);

      return map(
        _.mapValues(obj, function (v) {
          return _.isPlainObject(v)
            ? _.deeply(map)(v, fn)
            : _.isArray(v)
            ? deeplyArray(v, fn)
            : v;
        }),
        fn
      );
    };
  }
});