How to Extract filtered objects using lodash or JavaScript [duplicate]

Question

Hi i have an collection like this, i am trying to filter the collection,can anybdy help me on this

[{
        "parent_id": "DISTRIBUTOR1",
        "id": "DISTRIBUTOR3",
        "permission": "Yes",
        "country_name": "India"
    },
    {
        "parent_id": "DISTRIBUTOR2",
        "id": "DISTRIBUTOR3",
        "permission": "NO",
        "country_name": "India"
    },
    {
        "parent_id": "DISTRIBUTOR2",
        "id": "DISTRIBUTOR3",
        "permission": "YES",
        "city_name": "Hubli",
        "state_name": "Karnataka",
        "country_name": "India"
    },
      {
        "parent_id": "DISTRIBUTOR2",
        "id": "DISTRIBUTOR3",
        "permission": "YES",
        "city_name": "Bangalore",
        "state_name": "Karnataka",
        "country_name": "India"
    }]

I need an filtered collection where cityname should present and permission:"yes", the output i need is.

Output:

[

 {
        "parent_id": "DISTRIBUTOR2",
        "id": "DISTRIBUTOR3",
        "permission": "YES",
        "city_name": "Hubli",
        "state_name": "Karnataka",
        "country_name": "India"
    },
      {
        "parent_id": "DISTRIBUTOR2",
        "id": "DISTRIBUTOR3",
        "permission": "YES",
        "city_name": "Bangalore",
        "state_name": "Karnataka",
        "country_name": "India"
    }]

Nina Scholz · Accepted Answer · 2017-02-01 20:15:08Z

You could use Array#filter and check the wanted constraints.

var array = [{ parent_id: "DISTRIBUTOR1", id: "DISTRIBUTOR3", permission: "Yes", country_name: "India" }, { parent_id: "DISTRIBUTOR2", id: "DISTRIBUTOR3", permission: "NO", country_name: "India" }, { parent_id: "DISTRIBUTOR2", id: "DISTRIBUTOR3", permission: "YES", city_name: "Hubli", state_name: "Karnataka", country_name: "India" }, { parent_id: "DISTRIBUTOR2", id: "DISTRIBUTOR3", permission: "YES", city_name: "Bangalore", state_name: "Karnataka", country_name: "India" }],
    result = array.filter(function (a) {
        return a.city_name && a.permission === 'YES';
    });

console.log(result);

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lodash with _.chain and _.filter

var array = [{ parent_id: "DISTRIBUTOR1", id: "DISTRIBUTOR3", permission: "Yes", country_name: "India" }, { parent_id: "DISTRIBUTOR2", id: "DISTRIBUTOR3", permission: "NO", country_name: "India" }, { parent_id: "DISTRIBUTOR2", id: "DISTRIBUTOR3", permission: "YES", city_name: "Hubli", state_name: "Karnataka", country_name: "India" }, { parent_id: "DISTRIBUTOR2", id: "DISTRIBUTOR3", permission: "YES", city_name: "Bangalore", state_name: "Karnataka", country_name: "India" }],
    result = _
        .chain(array)
        .filter('city_name')
        .filter({ permission: 'YES' });

console.log(result);

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

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.min.js"></script>

Oscar Franco · Accepted Answer · 2017-02-01 20:11:50Z

This is the code you are looking for, using filter:

var arr = [{
            "parent_id": "DISTRIBUTOR1",
            "id": "DISTRIBUTOR3",
            "permission": "Yes",
            "country_name": "India"
        },
        {
            "parent_id": "DISTRIBUTOR2",
            "id": "DISTRIBUTOR3",
            "permission": "NO",
            "country_name": "India"
        },
        {
            "parent_id": "DISTRIBUTOR2",
            "id": "DISTRIBUTOR3",
            "permission": "YES",
            "city_name": "Hubli",
            "state_name": "Karnataka",
            "country_name": "India"
        },
          {
            "parent_id": "DISTRIBUTOR2",
            "id": "DISTRIBUTOR3",
            "permission": "YES",
            "city_name": "Bangalore",
            "state_name": "Karnataka",
            "country_name": "India"
        }]
    
    var filtered = arr.filter(function(item) {
      return item.city_name && item.permission === "YES"
    })
    
    console.log(filtered)

Filter takes a function and applies it to each element in the array, if the function returns true the item is kept, otherwise it is discarded.

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