How to find a value from array object in JavaScript?

Question

I have a array object I want to return and if it will find in this array otherwise it will return or I want to just return value not key.

Currently it returns an object and I need only a value.

const arrObj = [
    {
        "relation_type": "undefined"
    },
    {
        "relation_type": "or"
    },
    {
        "relation_type": "and"
    },
    {
        "relation_type": "or"
    },
    {
        "relation_type": "or"
    }
]


let obj = arrObj.find((o) => {
      if (o.relation_type === "and") {
        return true;
      }
});

console.log(obj);

If I understand that correctly you want something like const result = arrObj.some(o => o.relation_type === 'and') ? 'and' : 'or'. — Felix Kling
– Felix Kling, Commented Oct 4, 2022 at 15:17

rmfy · Accepted Answer · 2022-10-04 15:25:32Z

5

You could do something like that :

let obj = arrObj.find(o => o.relation_type === "and") ? "and" : "or"

edited Oct 4, 2022 at 15:25

answered Oct 4, 2022 at 15:18

rmfy

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4 Comments

Felix Kling Over a year ago

"One way to achieve this would be to return o.relation_type instead of true inside your obj variable." I assume you are referring to the call to .find but no, that's not how .find works. It doesn't return the value returned from the callback.

Felix Kling Over a year ago

arrObj.find(o => o.relation_type === "and").relation_type would always return "and" or throw an error.

Rohit Verma Over a year ago

@rmfy what about if there is "and" not available in array?

rmfy Over a year ago

@FelixKling you're right, updated my OP !

Neighbor · Accepted Answer · 2022-10-04 15:20:59Z

2

Maybe we can simply use destruction:

let {relation_type} = arrObj.find((o) => {
  if (o.relation_type === "and") {
    return true;
  }})

answered Oct 4, 2022 at 15:20

Neighbor

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Comments

AGWS · Accepted Answer · 2022-10-04 15:28:41Z

You can use the .map method and loop over and access the relation type as a property here is a working example

const arrObj = [
    {
        "relationtype": "undefined"
    },
    {
        "relationtype": "or"
    },
    {
        "relationtype": "and"
    },
    {
        "relationtype": "or"
    },
    {
        "relationtype": "or"
    }
]

{arrObj.map((object,index)=> 
console.log(object.relationtype)
    )}

.map() MDN Docs

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