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javascript - How to make an object with unique Key and unique value pair - Stack Overflow

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I want to make an object with having Key and unique value by iterating an array of objects up to its le

I want to make an object with having Key and unique value by iterating an array of objects up to its length.

I have my Json as

var data = [
            {sex: 'male', beaconKey: '121', userKey: '01', key:'k1', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 20, preferenceList: ['Fashion','Business','Sports'], ageGroup: 'LESS_THAN_15'}
            , {sex: 'male', beaconKey: '122', userKey: '01', key:'k2', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 22, preferenceList: ['Business'], ageGroup: 'BETWEEN_25_35'}
            , {sex: 'female', beaconKey: '123', userKey: '01', key:'k3', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 26, preferenceList: ['Housing'], ageGroup: 'BETWEEN_35_45'}
            , {sex: 'male', beaconKey: '121', userKey: '03', key:'k4', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 38, preferenceList: ['Business','Housing','Sports'], ageGroup: 'BETWEEN_25_35'}
            , {sex: 'female', beaconKey: '124', userKey: '03', key:'k5', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 20, preferenceList: ['Business','Housing','Sports'], ageGroup: 'BETWEEN_45_55'}
            , {sex: 'male', beaconKey: '125', userKey: '01', key:'k6', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 42, preferenceList: ['Jewels','Kids'], ageGroup: 'LESS_THAN_15'}
            , {sex: 'female', beaconKey: '123', userKey: '02', key:'k7', date: 'Tue Jul 05 06:26:59 UTC 2016', freq: 34, preferenceList: ['Movies'], ageGroup: 'BETWEEN_55_65'}
            , {sex: 'female', beaconKey: '121', userKey: '04', key:'k8', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 22, preferenceList: ['Culture'], ageGroup: 'BETWEEN_25_35'}
            , {sex: 'female', beaconKey: '124', userKey: '01', key:'k9', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 115, preferenceList: ['Kids'], ageGroup: 'BETWEEN_35_45'}
            , {sex: 'male', beaconKey: '122', userKey: '02', key:'k10', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 19, preferenceList: [], ageGroup: 'BETWEEN_45_55'}
            , {sex: 'female', beaconKey: '121',userKey: '01', key:'k11', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 24, preferenceList: [], ageGroup: 'BETWEEN_35_45'}
        ];

Can I have an another object from the above json as

var filterObj = {
                sex:[],
                age:[],
                category:[]
            };

and to have a unique values that are occurring in the JSON, Also I have multiple values for preferenceList, that should also be unique in the filterObj.

such like my result should be

filterObj = {
                sex:['male','female'],
                age:['LESS_THAN_15','BETWEEN_25_35','BETWEEN_35_45','BETWEEN_45_55','BETWEEN_55_65'],
                category:['Fashion','Business','Sports','Housing','Jewels','Kids','Movies','Kids']
            };

I want to make an object with having Key and unique value by iterating an array of objects up to its length.

I have my Json as

var data = [
            {sex: 'male', beaconKey: '121', userKey: '01', key:'k1', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 20, preferenceList: ['Fashion','Business','Sports'], ageGroup: 'LESS_THAN_15'}
            , {sex: 'male', beaconKey: '122', userKey: '01', key:'k2', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 22, preferenceList: ['Business'], ageGroup: 'BETWEEN_25_35'}
            , {sex: 'female', beaconKey: '123', userKey: '01', key:'k3', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 26, preferenceList: ['Housing'], ageGroup: 'BETWEEN_35_45'}
            , {sex: 'male', beaconKey: '121', userKey: '03', key:'k4', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 38, preferenceList: ['Business','Housing','Sports'], ageGroup: 'BETWEEN_25_35'}
            , {sex: 'female', beaconKey: '124', userKey: '03', key:'k5', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 20, preferenceList: ['Business','Housing','Sports'], ageGroup: 'BETWEEN_45_55'}
            , {sex: 'male', beaconKey: '125', userKey: '01', key:'k6', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 42, preferenceList: ['Jewels','Kids'], ageGroup: 'LESS_THAN_15'}
            , {sex: 'female', beaconKey: '123', userKey: '02', key:'k7', date: 'Tue Jul 05 06:26:59 UTC 2016', freq: 34, preferenceList: ['Movies'], ageGroup: 'BETWEEN_55_65'}
            , {sex: 'female', beaconKey: '121', userKey: '04', key:'k8', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 22, preferenceList: ['Culture'], ageGroup: 'BETWEEN_25_35'}
            , {sex: 'female', beaconKey: '124', userKey: '01', key:'k9', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 115, preferenceList: ['Kids'], ageGroup: 'BETWEEN_35_45'}
            , {sex: 'male', beaconKey: '122', userKey: '02', key:'k10', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 19, preferenceList: [], ageGroup: 'BETWEEN_45_55'}
            , {sex: 'female', beaconKey: '121',userKey: '01', key:'k11', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 24, preferenceList: [], ageGroup: 'BETWEEN_35_45'}
        ];

Can I have an another object from the above json as

var filterObj = {
                sex:[],
                age:[],
                category:[]
            };

and to have a unique values that are occurring in the JSON, Also I have multiple values for preferenceList, that should also be unique in the filterObj.

such like my result should be

filterObj = {
                sex:['male','female'],
                age:['LESS_THAN_15','BETWEEN_25_35','BETWEEN_35_45','BETWEEN_45_55','BETWEEN_55_65'],
                category:['Fashion','Business','Sports','Housing','Jewels','Kids','Movies','Kids']
            };
  • javascript
  • arrays
  • json
  • object
Share Improve this question asked Jul 14, 2016 at 8:51 RaichuRaichu 2471 gold badge7 silver badges21 bronze badges 2
  • You can simply iterate your data array and add to filterObj if it is not already existing – Weedoze Commented Jul 14, 2016 at 8:55
  • Possible duplicate of stackoverflow./questions/20739575/… – M22an Commented Jul 14, 2016 at 8:57
Add a ment  | 

5 Answers 5

Reset to default 3

You will basically have to iterate over the array data. The best way to find unique values in the array is to use key, value data structure (hash tables), like a Javascript Object.

var sex = {};
var age = {};

data.forEach(function (obj, index) {    
    sex[obj.sex] = index;
    age[obj.age] = index;
});

var filterObj = {};
filterObj['sex'] = Object.keys(sex);
filterObj['age'] = Object.keys(age);

Make object with unique Key and value pair in javascript

function getMapObject(dataList, key) {
var lookup = {};
for ( var i in dataList) {

    var tempArr = [];
    if (lookup[dataList[i][key]] != undefined) {
        tempArr = lookup[dataList[i][key]];
        tempArr.push(dataList[i]);
        lookup[dataList[i][key]] = tempArr;
    } else {
        tempArr.push(dataList[i]);
        lookup[dataList[i][key]] = tempArr;
    }
}
return lookup;}

try this

var data = [
            {sex: 'male', beaconKey: '121', userKey: '01', key:'k1', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 20, preferenceList: ['Fashion','Business','Sports'], ageGroup: 'LESS_THAN_15'}
            , {sex: 'male', beaconKey: '122', userKey: '01', key:'k2', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 22, preferenceList: ['Business'], ageGroup: 'BETWEEN_25_35'}
            , {sex: 'female', beaconKey: '123', userKey: '01', key:'k3', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 26, preferenceList: ['Housing'], ageGroup: 'BETWEEN_35_45'}
            , {sex: 'male', beaconKey: '121', userKey: '03', key:'k4', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 38, preferenceList: ['Business','Housing','Sports'], ageGroup: 'BETWEEN_25_35'}
            , {sex: 'female', beaconKey: '124', userKey: '03', key:'k5', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 20, preferenceList: ['Business','Housing','Sports'], ageGroup: 'BETWEEN_45_55'}
            , {sex: 'male', beaconKey: '125', userKey: '01', key:'k6', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 42, preferenceList: ['Jewels','Kids'], ageGroup: 'LESS_THAN_15'}
            , {sex: 'female', beaconKey: '123', userKey: '02', key:'k7', date: 'Tue Jul 05 06:26:59 UTC 2016', freq: 34, preferenceList: ['Movies'], ageGroup: 'BETWEEN_55_65'}
            , {sex: 'female', beaconKey: '121', userKey: '04', key:'k8', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 22, preferenceList: ['Culture'], ageGroup: 'BETWEEN_25_35'}
            , {sex: 'female', beaconKey: '124', userKey: '01', key:'k9', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 115, preferenceList: ['Kids'], ageGroup: 'BETWEEN_35_45'}
            , {sex: 'male', beaconKey: '122', userKey: '02', key:'k10', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 19, preferenceList: [], ageGroup: 'BETWEEN_45_55'}
            , {sex: 'female', beaconKey: '121',userKey: '01', key:'k11', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 24, preferenceList: [], ageGroup: 'BETWEEN_35_45'}
        ];

var filterObj = {  sex:[], age:[], category:[] };

//iterate all objects in data
data.forEach( function( obj ){
  //check if value is already there in the array before putting the same in filterObj
  filterObj.sex.indexOf( obj.sex ) == -1 && filterObj.sex.push( obj.sex );
  filterObj.age.indexOf( obj.ageGroup ) == -1 && filterObj.age.push( obj.ageGroup );
  filterObj.category = filterObj.category.concat( obj.preferenceList ) ;
});

//find unique categories
var map = {}; 
filterObj.category.forEach( function(cat){ map[cat] = true }); 
filterObj.category = Object.keys( map );

console.log( filterObj );

You could use an object as hash table for already inserted items to the filtered result.

This proposal uses a map for the wanted properties. It is easy to extend, just add another map name as property and the original property of data as value.

{
    "sex": "sex",
    "age": "ageGroup",
    "category": "preferenceList"
}


var data = [{ sex: 'male', beaconKey: '121', userKey: '01', key: 'k1', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 20, preferenceList: ['Fashion', 'Business', 'Sports'], ageGroup: 'LESS_THAN_15' }, { sex: 'male', beaconKey: '122', userKey: '01', key: 'k2', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 22, preferenceList: ['Business'], ageGroup: 'BETWEEN_25_35' }, { sex: 'female', beaconKey: '123', userKey: '01', key: 'k3', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 26, preferenceList: ['Housing'], ageGroup: 'BETWEEN_35_45' }, { sex: 'male', beaconKey: '121', userKey: '03', key: 'k4', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 38, preferenceList: ['Business', 'Housing', 'Sports'], ageGroup: 'BETWEEN_25_35' }, { sex: 'female', beaconKey: '124', userKey: '03', key: 'k5', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 20, preferenceList: ['Business', 'Housing', 'Sports'], ageGroup: 'BETWEEN_45_55' }, { sex: 'male', beaconKey: '125', userKey: '01', key: 'k6', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 42, preferenceList: ['Jewels', 'Kids'], ageGroup: 'LESS_THAN_15' }, { sex: 'female', beaconKey: '123', userKey: '02', key: 'k7', date: 'Tue Jul 05 06:26:59 UTC 2016', freq: 34, preferenceList: ['Movies'], ageGroup: 'BETWEEN_55_65' }, { sex: 'female', beaconKey: '121', userKey: '04', key: 'k8', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 22, preferenceList: ['Culture'], ageGroup: 'BETWEEN_25_35' }, { sex: 'female', beaconKey: '124', userKey: '01', key: 'k9', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 115, preferenceList: ['Kids'], ageGroup: 'BETWEEN_35_45' }, { sex: 'male', beaconKey: '122', userKey: '02', key: 'k10', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 19, preferenceList: [], ageGroup: 'BETWEEN_45_55' }, { sex: 'female', beaconKey: '121', userKey: '01', key: 'k11', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 24, preferenceList: [], ageGroup: 'BETWEEN_35_45' }],
    map = { sex: 'sex', age: 'ageGroup', category: 'preferenceList' },
    filterObj = {};

data.forEach(function (a) {
    Object.keys(map).forEach(function (k) {
        filterObj[k] = filterObj[k] || [];
        this[k] = this[k] || {};
        (Array.isArray(a[map[k]]) ? a[map[k]] : [a[map[k]]]).forEach(function (b) {
            if (!this[k][b]) {
                this[k][b] = true;
                filterObj[k].push(b);
            }
        }, this);
    }, this);
}, {});

console.log(filterObj);

I remend you to use lodash library:

var data = [
        {sex: 'male', beaconKey: '121', userKey: '01', key:'k1', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 20, preferenceList: ['Fashion','Business','Sports'], ageGroup: 'LESS_THAN_15'}
        , {sex: 'male', beaconKey: '122', userKey: '01', key:'k2', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 22, preferenceList: ['Business'], ageGroup: 'BETWEEN_25_35'}
        , {sex: 'female', beaconKey: '123', userKey: '01', key:'k3', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 26, preferenceList: ['Housing'], ageGroup: 'BETWEEN_35_45'}
        , {sex: 'male', beaconKey: '121', userKey: '03', key:'k4', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 38, preferenceList: ['Business','Housing','Sports'], ageGroup: 'BETWEEN_25_35'}
        , {sex: 'female', beaconKey: '124', userKey: '03', key:'k5', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 20, preferenceList: ['Business','Housing','Sports'], ageGroup: 'BETWEEN_45_55'}
        , {sex: 'male', beaconKey: '125', userKey: '01', key:'k6', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 42, preferenceList: ['Jewels','Kids'], ageGroup: 'LESS_THAN_15'}
        , {sex: 'female', beaconKey: '123', userKey: '02', key:'k7', date: 'Tue Jul 05 06:26:59 UTC 2016', freq: 34, preferenceList: ['Movies'], ageGroup: 'BETWEEN_55_65'}
        , {sex: 'female', beaconKey: '121', userKey: '04', key:'k8', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 22, preferenceList: ['Culture'], ageGroup: 'BETWEEN_25_35'}
        , {sex: 'female', beaconKey: '124', userKey: '01', key:'k9', date: 'Tue Jul 05 11:59:28 UTC 2016', freq: 115, preferenceList: ['Kids'], ageGroup: 'BETWEEN_35_45'}
        , {sex: 'male', beaconKey: '122', userKey: '02', key:'k10', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 19, preferenceList: [], ageGroup: 'BETWEEN_45_55'}
        , {sex: 'female', beaconKey: '121',userKey: '01', key:'k11', date: 'Wed Jul 06 06:26:59 UTC 2016', freq: 24, preferenceList: [], ageGroup: 'BETWEEN_35_45'}
    ];

var filterObj = {
  sex: _.uniq(_.map(data,'sex')),
  age: _.uniq(_.map(data,'ageGroup')),
  category: _.union.apply(_,_.map(data,'preferenceList'))
};

Here you have the plnkdr:

http://plnkr.co/edit/SStCvyYdSYbmBi8xzX1a?p=preview

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