How to convert array object to single array?

Question

I have an object array. I need to convert it single array without key.

I need array like this:

["test","test"]

I also need to remove that value if I got undefined instead of other value.

My code:

const list = [
    {
        "type": "undefined"
    },
    {
        "type": "test"
    },
    {
        "type": "test"
    }
]

var findAndValue = list.map(Object.values);
console.log(findAndValue);

list.map(({ type }) => type).filter(v => v !== "undefined") — 0stone0
– 0stone0, Commented Nov 4, 2022 at 15:14
Does this answer your question? How can I remove a specific item from an array? — 0stone0
– 0stone0, Commented Nov 4, 2022 at 15:17
Are you sure you want to test for undefined given as string value? — Ibrahim Sharaf
– Ibrahim Sharaf, Commented Nov 4, 2022 at 15:21
@RohitVerma Did you get a chance to look into the answer I added ? I hope it will work as per your expectation. — Rohìt Jíndal
– Rohìt Jíndal, Commented Nov 6, 2022 at 16:59

David · Accepted Answer · 2022-11-04 15:16:40Z

1

If you just want the value from one property, only return that property value from the map operation:

const list = [
  { "type": "undefined" },
  { "type": "test" },
  { "type": "test" }
];
const result = list.map(x => x.type);
console.log(result);

To filter out the "undefined" string, use filter:

const list = [
  { "type": "undefined" },
  { "type": "test" },
  { "type": "test" }
];
const result = list.map(x => x.type).filter(x => x !== "undefined");
console.log(result);

answered Nov 4, 2022 at 15:16

David

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Comments

Wizard · Accepted Answer · 2022-11-04 15:18:14Z

1

2 steps:

First extract all the values into a list

Second, remove any values you dont want

const values = list.map(({ type }) => type)
cosnt filteredValues = values.filter(val => val !== undefined)

answered Nov 4, 2022 at 15:18

Wizard

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Comments

Rohìt Jíndal · Accepted Answer · 2022-11-05 16:04:37Z

1

Are you sure undefined is a string type ? Ideally it should be just undefined and we can filter that out by using Boolean along with filter method.

Live Demo :

const list = [
  { "type": undefined },
  { "type": "test" },
  { "type": "test" }
];
const res = list.map(({ type }) => type).filter(Boolean);

console.log(res);

answered Nov 5, 2022 at 16:04

Rohìt Jíndal

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