Question

9

Javascript nested filters in Array of arrays

rated 0 times [ 12] [ 3] / answers: 1 / hits: 26412 / 8 Years ago, sun, june 26, 2016, 12:00:00

I have an array of objects in this format:

var full_list = [

        {

            pid: 1,

            items:[

                {item_id: '9'},

                {item_id: '10'},

                {item_id: '12'}

            ]

        },

        {

            pid: 2,

            items:[

                {item_id: '33'},

                {item_id: '22'},

                {item_id: '65'}

            ]

        }...

    ];

I have a tmp array which consists of objects from the full array:

 var tmp_list =  [

        {

            pid: 2,

            items:[

                {item_id: '33'},

                {item_id: '22'},

                {item_id: '65'}

            ]

        }, {....}

I would like to filter out objects from the full list where at least one of selectedIDs values appears in the object's item's id array

var selectedIDs = {'1', '9', '45', ....};

and then add them to the tmp list.

I tried using filters but I failed to figure it out completely.

Thank you.

selectedIDs.forEach(function(id) {

                var tmp = full_list.filter(function (obj) {

                            obj.items.forEach(function (item) {

                                if (item.id === id) {

                                    console.log('found');

                                }

                            });

                        });

                        tmp_list.push(tmp);

                 });

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jordenfabiand

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3 Years ago

answered 8 Years ago jaelyn · Accepted Answer

First of all, this line in your question is wrong

var selectedIDs = {'1', '9', '45', ....};

You cannot declare arrays using {}. Instead use []

For your problem you can use a pure functional approach using Array#filter and Array#some methods to get your desired result as below:

var full_list = [

  {

    pid: 1,

    items:[

      {item_id: '9'},

      {item_id: '10'},

      {item_id: '12'}

    ]

  },

  {

    pid: 2,

    items:[

      {item_id: '33'},

      {item_id: '22'},

      {item_id: '67'}

    ]

  },

  {

    pid: 9,

    items:[

      {item_id: '33'},

      {item_id: '22'},

      {item_id: '65'}

    ]

  },

  {

    pid: 7,

    items:[

      {item_id: '7'},

      {item_id: '22'},

      {item_id: '65'}

    ]

  }

];



var tmp_list = [

  {

    pid: 2,

    items:[

      {item_id: '7'},

      {item_id: '22'},

      {item_id: '65'}

    ]

  }

];





function filterResult (selectedItems) {

  return full_list.filter(function (process) {

    return process.items.some(function(item){

      return selectedItems.indexOf(item.item_id) > -1;

    });

  });

}



var selectedItems = ['9', '7', '22', '10'];



tmp_list = tmp_list.concat(filterResult(selectedItems))



console.log(tmp_list);





function flattenResults(list, selections) {

  return list.reduce(function (accumulator, current) {

    var res = current.items.filter(function(item){

      return (selections.indexOf(item.item_id) > -1 

              && checkIfAlreadyExist());

              

      function checkIfAlreadyExist () {

        return accumulator.every(function (k) {

          return k.item_id !== item.item_id;

        });

      }        

    });   



    return accumulator.concat(res);

  }, []);

}



console.log(flattenResults(full_list, selectedItems));