Delete list of objects based from an array ids using ES6

Question

I have an arrays with ids and object lists with same ids contained in arrays, how can I remove objects based from array ids?

array:

user_ids: [“id001”, “id004”]

object list:

{
    {
        “user_id”: “id001”,
        “city”: “Seattle”
    },
    {
        “user_id”: “id002”,
        “city”: “Los Angeles”
    },
    {
        “user_id”: “id003”,
        “city”: “San Francisco”
    },
    {
        “user_id”: “id004”,
        “city”: “San Diego”
    }
}

so the result would be:

{
    {
        “user_id”: “id002”,
        “city”: “Los Angeles”
    },
    {
        “user_id”: “id003”,
        “city”: “San Francisco”
    }
}

Is that object an array of objects?

Caleb H.
– Caleb H.

2018-11-16 00:10:47 +00:00
Commented Nov 16, 2018 at 0:10 — Caleb H.
– Caleb H., Commented Nov 16, 2018 at 0:10
Your example is not syntactically valid.

Jared Smith
– Jared Smith

2018-11-16 00:33:33 +00:00
Commented Nov 16, 2018 at 0:33 — Jared Smith
– Jared Smith, Commented Nov 16, 2018 at 0:33

Will · Accepted Answer · 2018-11-16 00:28:47Z

1

Array methods

Array.prototype.filter()

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

The filter() method creates a new array with all elements that pass the test implemented by the provided function.

Array.prototype.includes()

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes

The includes() method determines whether an array includes a certain element, returning true or false as appropriate.

let user_ids = ["id001", "id004"];
let list = [
    {
        "user_id": "id001",
        "city": "Seattle"
    },
    {
        "user_id": "id002",
        "city": "Los Angeles"
    },
    {
        "user_id": "id003",
        "city": "San Francisco"
    },
    {
        "user_id": "id004",
        "city": "San Diego"
    }
];

console.log(list.filter( o => !(user_ids.includes(o.user_id)) ));

edited Nov 16, 2018 at 0:28

answered Nov 16, 2018 at 0:14

Will

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Comments

Caleb H. · Accepted Answer · 2018-11-16 00:15:37Z

0

If the list of objects is an array, you could do it like so:

for (var i = 0;i<object_list.length;i++){
    if (object_list[i]["user_id"] in user_ids){
        object_list.splice(i, 1);
    }
}

If it is an object, it could be done this way:

for (var i in object_list){
    if (object_list[i]["user_id"] in user_ids){
        delete object_list[i];
    }
}

answered Nov 16, 2018 at 0:15

Caleb H.

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