lodash-deeper/deep-filter-factory.js

some lodash mixins for deep operations on plain objects

module.exports = function (_) {
  return {
    filterDeep: function filterDeep (collection, predicate) {
      predicate = predicate || _.identity
      collection = { parent: collection }
      return deeplyFilters(collection, predicate, [])
    }
  }

  function deeplyFilters (collection, predicate, visited) {
    if (_.isObject(collection)) {
      return _.filter(collection, predicate).concat(_.flatten(_.map(collection, function (val) {
        if (notYetTraversed(val, visited)) {
          return deeplyFilters(val, predicate, visited.concat(collection))
        } else {
          return []
        }
      })))
    } else {
      return []
    }
  }

  function notYetTraversed (val, visited) {
    return !_.some(visited, function (other) {
      return other === val
    })
  }
}