javascript filter array multiple conditions

Question

I want to simplify an array of objects. Let's assume that I have following array:

var users = [{
    name: 'John',
    email: 'johnson@mail.com',
    age: 25,
    address: 'USA'
    },
    {
        name: 'Tom',
        email: 'tom@mail.com',
        age: 35,
        address: 'England'
    },
    {
        name: 'Mark',
        email: 'mark@mail.com',
        age: 28,
        address: 'England'
}];

And filter object:

var filter = {address: 'England', name: 'Mark'};

For example i need to filter all users by address and name, so i do loop through filter object properties and check it out:

function filterUsers (users, filter) {
    var result = [];
    for (var prop in filter) {
        if (filter.hasOwnProperty(prop)) {

            //at the first iteration prop will be address
            for (var i = 0; i < filter.length; i++) {
                if (users[i][prop] === filter[prop]) {
                    result.push(users[i]);
                }
            }
        }
    }
    return result;
}

So during first iteration when prop - address will be equal 'England' two users will be added to array result (with name Tom and Mark), but on the second iteration when prop name will be equal Mark only the last user should be added to array result, but i end up with two elements in array.

I have got a little idea as why is it happening but still stuck on it and could not find a good solution to fix it. Any help is appreciable. Thanks.

Answer 1

You can do like this

 var filter = { address: 'England', name: 'Mark' }; var users = [{ name: 'John', email: 'johnson@mail.com', age: 25, address: 'USA' }, { name: 'Tom', email: 'tom@mail.com', age: 35, address: 'England' }, { name: 'Mark', email: 'mark@mail.com', age: 28, address: 'England' } ]; users= users.filter(function(item) { for (var key in filter) { if (item[key] === undefined || item[key] != filter[key]) return false; } return true; }); console.log(users)

Answer 2

如果您知道过滤器的名称，则可以在一行中完成。

users = users.filter(obj => obj.name == filter.name && obj.address == filter.address)

Answer 3

Another take for those of you that enjoy succinct code.

NOTE : The FILTER method can take an additional this argument, then using an E6 arrow function we can reuse the correct this to get a nice one-liner.

 var users = [{name: 'John',email: 'johnson@mail.com',age: 25,address: 'USA'}, {name: 'Tom',email: 'tom@mail.com',age: 35,address: 'England'}, {name: 'Mark',email: 'mark@mail.com',age: 28,address: 'England'}]; var query = {address: "England", name: "Mark"}; var result = users.filter(search, query); function search(user){ return Object.keys(this).every((key) => user[key] === this[key]); } // |----------------------- Code for displaying results -----------------| var element = document.getElementById('result'); function createMarkUp(data){ Object.keys(query).forEach(function(key){ var p = document.createElement('p'); p.appendChild(document.createTextNode( key.toUpperCase() + ': ' + result[0][key])); element.appendChild(p); }); } createMarkUp(result);

 <div id="result"></div>

Answer 4

Here is ES6 version of using arrow function in filter. Posting this as an answer because most of us are using ES6 these days and may help readers to do filter in advanced way using arrow function, let and const.

 const filter = { address: 'England', name: 'Mark' }; let users = [{ name: 'John', email: 'johnson@mail.com', age: 25, address: 'USA' }, { name: 'Tom', email: 'tom@mail.com', age: 35, address: 'England' }, { name: 'Mark', email: 'mark@mail.com', age: 28, address: 'England' } ]; users= users.filter(item => { for (let key in filter) { if (item[key] === undefined || item[key] != filter[key]) return false; } return true; }); console.log(users)

Answer 5

Using Array.Filter() with Arrow Functions we can achieve this using

users = users.filter(x => x.name == 'Mark' && x.address == 'England');

Here is the complete snippet

 // initializing list of users var users = [{ name: 'John', email: 'johnson@mail.com', age: 25, address: 'USA' }, { name: 'Tom', email: 'tom@mail.com', age: 35, address: 'England' }, { name: 'Mark', email: 'mark@mail.com', age: 28, address: 'England' } ]; //filtering the users array and saving //result back in users variable users = users.filter(x => x.name == 'Mark' && x.address == 'England'); //logging out the result in console console.log(users);

Answer 6

Can also be done this way:

    this.users = this.users.filter((item) => {
                return (item.name.toString().toLowerCase().indexOf(val.toLowerCase()) > -1 ||
                item.address.toLowerCase().indexOf(val.toLowerCase()) > -1 ||
                item.age.toLowerCase().indexOf(val.toLowerCase()) > -1 ||
                item.email.toLowerCase().indexOf(val.toLowerCase()) > -1);
            })

Answer 7

I think this might help.

 const filters = ['a', 'b']; const results = [ { name: 'Result 1', category: ['a'] }, { name: 'Result 2', category: ['a', 'b'] }, { name: 'Result 3', category: ['c', 'a', 'b', 'd'] } ]; const filteredResults = results.filter(item => filters.every(val => item.category.indexOf(val) > -1) ); console.log(filteredResults);

Answer 8

Improving on the good answers here, below is my solution:

const rawData = [
  { name: 'John', email: 'johnson@mail.com', age: 25, address: 'USA' },
  { name: 'Tom', email: 'tom@mail.com', age: 35, address: 'England' },
  { name: 'Mark', email: 'mark@mail.com', age: 28, address: 'England' }
]
const filters = { address: 'England', age: 28 }

const filteredData = rawData.filter(i =>
  Object.entries(filters).every(([k, v]) => i[k] === v)
)

Answer 9

In lodash,

_.filter(users,{address: 'England', name: 'Mark'})

In es6,

users.filter(o => o.address == 'England' && o.name == 'Mark')

Answer 10

users.filter(o => o.address == 'England' && o.name == 'Mark')

Much better for es6. or you can use || (or) operator like this

users.filter(o => {return (o.address == 'England' || o.name == 'Mark')})

Answer 11

If you want to put multiple conditions in filter , you can use && and || operator.

var product= Object.values(arr_products).filter(x => x.Status==status && x.email==user)

Answer 12

Dynamic filters with AND condition

Filter out people with gender = 'm'

 var people = [ { name: 'john', age: 10, gender: 'm' }, { name: 'joseph', age: 12, gender: 'm' }, { name: 'annie', age: 8, gender: 'f' } ] var filters = { gender: 'm' } var out = people.filter(person => { return Object.keys(filters).every(filter => { return filters[filter] === person[filter] }); }) console.log(out)

Filter out people with gender = 'm' and name = 'joseph'

 var people = [ { name: 'john', age: 10, gender: 'm' }, { name: 'joseph', age: 12, gender: 'm' }, { name: 'annie', age: 8, gender: 'f' } ] var filters = { gender: 'm', name: 'joseph' } var out = people.filter(person => { return Object.keys(filters).every(filter => { return filters[filter] === person[filter] }); }) console.log(out)

You can give as many filters as you want.

Answer 13

functional solution

function applyFilters(data, filters) {
  return data.filter(item =>
    Object.keys(filters)
      .map(keyToFilterOn =>
        item[keyToFilterOn].includes(filters[keyToFilterOn]),
      )
      .reduce((x, y) => x && y, true),
  );
}

this should do the job

applyFilters(users, filter);

Answer 14

You'll have more flexibility if you turn the values in your filter object into arrays:

var filter = {address: ['England'], name: ['Mark'] };

That way you can filter for things like "England" or "Scotland", meaning that results may include records for England, and for Scotland:

var filter = {address: ['England', 'Scotland'], name: ['Mark'] };

With that setup, your filtering function can be:

 const applyFilter = (data, filter) => data.filter(obj => Object.entries(filter).every(([prop, find]) => find.includes(obj[prop])) ); // demo var users = [{name: 'John',email: 'johnson@mail.com',age: 25,address: 'USA'},{name: 'Tom',email: 'tom@mail.com',age: 35,address: 'England'},{name: 'Mark',email: 'mark@mail.com',age: 28,address: 'England'}];var filter = {address: ['England'], name: ['Mark'] }; var filter = {address: ['England'], name: ['Mark'] }; console.log(applyFilter(users, filter));

Answer 15

A clean and functional solution

const combineFilters = (...filters) => (item) => {
    return filters.map((filter) => filter(item)).every((x) => x === true);
};

then you use it like so:

const filteredArray = arr.filter(combineFilters(filterFunc1, filterFunc2));

and filterFunc1 for example might look like this:

const filterFunc1 = (item) => {
  return item === 1 ? true : false;
};

Answer 16

My solution, based on NIKHIL CM solution:

 let data = [
    { 
      key1: "valueA1", 
      key2: "valueA2",
      key3: []
    },{
      key1: "valueB1", 
      key2: "valueB2"
      key3: ["valuesB3"]
    }
 ];

 let filters = {
    key1: "valueB1",
    key2: "valueB2"
 };

 let filteredData = data.filter((item) => {
     return Object.entries(filters).every(([filter, value]) => {
          return item[filter] === value;
          //Here i am applying a bit more logic like 
          //return item[filter].includes(value) 
          //or filter with not exactly same key name like
          //return !isEmpty(item.key3)
     });
 });

Answer 17

If the finality of you code is to get the filtered user, I would invert the for to evaluate the user instead of reducing the result array during each iteration.

Here an (untested) example:

function filterUsers (users, filter) {
    var result = [];

    for (i=0;i<users.length;i++){
        for (var prop in filter) {
            if (users.hasOwnProperty(prop) && users[i][prop] === filter[prop]) {
                result.push(users[i]);
            }
        }
    }
    return result;
}

Answer 18

with the composition of some little helpers:

const filter = {address: 'England', name: 'Mark'};
console.log( 
  users.filter(and(map(propMatches)(filter)))
)

function propMatches<T>(property: string, value: any) {
  return (item: T): boolean => item[property] === value
}

function map<T>(mapper: (key: string, value: any, obj: T) => (item:T) => any) {
  return (obj: T) => {
    return Object.keys(obj).map((key) => {
      return mapper(key, obj[key], obj)
    });
  }
}

export function and<T>(predicates: ((item: T) => boolean)[]) {
  return (item: T) =>
    predicates.reduce(
        (acc: boolean, predicate: (item: T) => boolean) => {
            if (acc === undefined) {
                return !!predicate(item);
            }
            return !!predicate(item) && acc;
        },
        undefined // initial accumulator value
    );
}

Answer 19

This is an easily understandable functional solution

 let filtersObject = { address: "England", name: "Mark" }; let users = [{ name: 'John', email: 'johnson@mail.com', age: 25, address: 'USA' }, { name: 'Tom', email: 'tom@mail.com', age: 35, address: 'England' }, { name: 'Mark', email: 'mark@mail.com', age: 28, address: 'England' } ]; function filterUsers(users, filtersObject) { //Loop through all key-value pairs in filtersObject Object.keys(filtersObject).forEach(function(key) { //Loop through users array checking each userObject users = users.filter(function(userObject) { //If userObject's key:value is same as filtersObject's key:value, they stay in users array return userObject[key] === filtersObject[key] }) }); return users; } //ES6 function filterUsersES(users, filtersObject) { for (let key in filtersObject) { users = users.filter((userObject) => userObject[key] === filtersObject[key]); } return users; } console.log(filterUsers(users, filtersObject)); console.log(filterUsersES(users, filtersObject));

Answer 20

This is another method i figured out, where filteredUsers is a function that returns the sorted list of users.

 var filtersample = {address: 'England', name: 'Mark'}; filteredUsers() { return this.users.filter((element) => { return element['address'].toLowerCase().match(this.filtersample['address'].toLowerCase()) || element['name'].toLowerCase().match(this.filtersample['name'].toLowerCase()); }) }

Answer 21

const users = [{
    name: 'John',
    email: 'johnson@mail.com',
    age: 25,
    address: 'USA'
  },
  {
    name: 'Tom',
    email: 'tom@mail.com',
    age: 35,
    address: 'England'
  },
  {
    name: 'Mark',
    email: 'mark@mail.com',
    age: 28,
    address: 'England'
  }
];

const filteredUsers = users.filter(({ name, age }) => name === 'Tom' && age === 35)

console.log(filteredUsers)

Answer 22

Using lodash and not pure javascript

This is actually quite simple using lodash and very easy to add/modify filters.

import _ from 'lodash';

async getUsersWithFilter(filters) {
     const users = yourArrayOfSomethingReally();

    // Some properties of the 'filters' object can be null or undefined, so create a new object without those undefined properties and filter by those who are defined
    const filtersWithoutUndefinedValuesObject = _.omitBy(
      filters,
      _.isNil,
    );

    return _.filter(users, { ...filtersWithoutUndefinedValuesObject });
}

1. The omitBy function checks your filters object and removes any value that is null or undefined (if you take it out, the lodash.filter function wont return any result.

2. The filter function will filter out all the objects who's values don't match with the object you pass as a second argument to the function (which in this case, is your filters object.)

Why use this?

Well, assume you have this object:

const myFiltersObj = {

   name: "Java",
   age: 50

};

If you want to add another filter, just add a new property to the myFilterObj , like this:

const myFiltersObj = {

   name: "Java",
   email: 50,
   country: "HND"

};

Call the getUsersWithFilter function, and it will work just fine. If you skip, let's say the name property in the object, the getUsersWithFilter function will filter by the email and country just fine.

Answer 23

Please check below code snippet with data you provided, it will return filtered data on the basis of multiple columns.

 var filter = { address: 'India', age: '27' }; var users = [{ name: 'Nikhil', email: 'nikhil@mail.com', age: 27, address: 'India' }, { name: 'Minal', email: 'minal@mail.com', age: 27, address: 'India' }, { name: 'John', email: 'johnson@mail.com', age: 25, address: 'USA' }, { name: 'Tom', email: 'tom@mail.com', age: 35, address: 'England' }, { name: 'Mark', email: 'mark@mail.com', age: 28, address: 'England' } ]; function filterByMultipleColumns(users, columnDataToFilter) { return users.filter(row => { return Object.keys(columnDataToFilter).every(propertyName => row[propertyName].toString().toLowerCase().indexOf(columnDataToFilter[propertyName].toString().toLowerCase()) > -1); }) } var filteredData = filterByMultipleColumns(users, filter); console.log(filteredData);

Result : [ { "name": "Nikhil", "email": "nikhil@mail.com", "age": 27, "address": "India" }, { "name": "Minal", "email": "minal@mail.com", "age": 27, "address": "India" } ]

Please check below link which can used with just small changes Javascript filter array multiple values – example

Answer 24

A question I was in the middle of answering got (properly) closed as duplicate of this. But I don't see any of the answers above quite like this one. So here's one more option.

We can write a simple function that takes a specification such as {name: 'mike', house: 'blue'} , and returns a function that will test if the value passed to it matches all the properties. It could be used like this:

 const where = (spec, entries = Object .entries (spec)) => (x) => entries .every (([k, v]) => x [k] == v) const users = [{name: 'John', email: 'johnson@mail.com', age: 25, address: 'USA'}, {name: 'Mark', email: 'marcus@mail.com', age: 25, address: 'USA'}, {name: 'Tom', email: 'tom@mail.com', age: 35, address: 'England'}, {name: 'Mark', email: 'mark@mail.com', age: 28, address: 'England'}] console .log ('Mark', users .filter (where ({name: 'Mark'}))) console .log ('England', users .filter (where ({address: 'England'}))) console .log ('Mark/England', users .filter (where ({name: 'Mark', address: 'England'})))

 .as-console-wrapper {max-height: 100% !important; top: 0}

And if we wanted to wrap the filtering into a single function, we could reuse that same function, wrapped up like this:

 const where = (spec, entries = Object .entries (spec)) => (x) => entries .every (([k, v]) => x [k] == v) const filterBy = (spec) => (xs) => xs .filter (where (spec)) const users = [{name: 'John', email: 'johnson@mail.com', age: 25, address: 'USA'}, {name: 'Mark', email: 'marcus@mail.com', age: 25, address: 'USA'}, {name: 'Tom', email: 'tom@mail.com', age: 35, address: 'England'}, {name: 'Mark', email: 'mark@mail.com', age: 28, address: 'England'}] console .log ('Mark/England', filterBy ({address: "England", name: "Mark"}) (users))

 .as-console-wrapper {max-height: 100% !important; top: 0}

(Of course that last doesn't have to be curried. We could change that so that we could call it with two parameters at once. I find this more flexible, but YMMV.)

Keeping it as a separate function has the advantage that we could then reuse it, in say, a find or some other matching situation.

---

This design is very similar to the use of where in Ramda (disclaimer: I'm one of Ramda's authors.) Ramda offers the additional flexibility of allowing arbitrary predicates instead of values that have to be equal. So in Ramda, you might write something like this instead:

filter (where ({
  address: equals ('England')
  age: greaterThan (25)
}) (users)

It's much the same idea, only a bit more flexible.

Answer 25

We can use different operators to provide multiple condtion to filter the array in the following way

Useing OR (||) Operator:

 const orFilter = [{a:1, b: 3}, {a:1,b:2}, {a: 2, b:2}].filter(d => (da== 1 || db,== 2)) console.log(orFilter, 'orFilter')

Using AND (&&) Operator:

 const andFilter = [{a:1, b: 3}, {a:1,b:2}, {a: 2, b:2}].filter(d => (da== 1 && db,== 2)) console.log(andFilter, 'andFilter')

Answer 26

const data = [{
    realName: 'Sean Bean',
    characterName: 'Eddard “Ned” Stark'
}, {
    realName: 'Kit Harington',
    characterName: 'Jon Snow'
}, {
    realName: 'Peter Dinklage',
    characterName: 'Tyrion Lannister'
}, {
    realName: 'Lena Headey',
    characterName: 'Cersei Lannister'
}, {
    realName: 'Michelle Fairley',
    characterName: 'Catelyn Stark'
}, {
    realName: 'Nikolaj Coster-Waldau',
    characterName: 'Jaime Lannister'
}, {
    realName: 'Maisie Williams',
    characterName: 'Arya Stark'
}];

const filterKeys = ['realName', 'characterName'];


const multiFilter = (data = [], filterKeys = [], value = '') => data.filter((item) => filterKeys.some(key => item[key].toString().toLowerCase().includes(value.toLowerCase()) && item[key]));


let filteredData = multiFilter(data, filterKeys, 'stark');

console.info(filteredData);
/* [{
  "realName": "Sean Bean",
  "characterName": "Eddard “Ned” Stark"
}, {
  "realName": "Michelle Fairley",
  "characterName": "Catelyn Stark"
}, {
  "realName": "Maisie Williams",
  "characterName": "Arya Stark"
}]
 */

Answer 27

arr.filter((item) => {
       if(condition)
       {
         return false;
       }
       return true;
    });