map json object to key/value objects [closed]

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I have a json as follows.

order = 
    {
        requests: [
            { code: 'T1', id: '123', requestStatus: 'request' },
            { code: 'T2', id: '321', requestStatus: 'request' }
        ]
    }

I want to get an object with key/value pair as follows.

ids['123']='T1'
ids['321']='T2'

I tried with this.

const order = 
{
    requests: [
        { code: 'T1', id: '123', requestStatus: 'request' },
        { code: 'T2', id: '321', requestStatus: 'request' }
    ]
};

let id = order['requests'].map((r) => [r.code] = r.id);

console.log(ids['123'] == 'T1');
console.log(ids['321'] == 'T2');

I am getting an error ‘object null is not iterable (cannot read property Symbol(Symbol.iterator))’.

Can someone show me how to do it?

Thanks.

  • Requests is apparently null by the time you call map

    – 

  • Is order.requests assigned in an async function? If so, you’re probably not awaiting it properly.

    – 

  • (r: { code: string, id: string }) doesn’t seem to be valid syntax; did you mean {r: { code: string, id: string }}?

    – 

  • Definitely a dupe, just need to find it, but const ids = Object.fromEntries( order.requests.map(({ code, id }) => [id, code]));

    – 




  • 2

    Does this answer your question? How do I convert array of Objects into one Object in JavaScript?

    –  

const order = {
  requests: [
    {code: 'T1', id: '123', requestStatus: 'request'},
    {code: 'T2', id: '321', requestStatus: 'request'}
  ]
};


let ids = {};
order['requests'].forEach(({code, id}) => ids[id] = code);

console.log(ids);

prints

{ '123': 'T1', '321': 'T2' }

Note that I use destructuring assignment to unpack objects in the lambda expression.

You can use the Array.reduce method:

order = {
  requests: [
    {code: 'T1', id: '123', requestStatus: 'request'},
    {code: 'T2', id: '321', requestStatus: 'request'}
  ]
}

const ids = order.requests.reduce((acc, req) => {
    // Add each property to the accumulator
    acc[req.id] = req.code;
    return acc;
}, {}); // Start with an empty object



const order = {
  requests: [
    { code: 'T1', id: '123', requestStatus: 'request' },
    { code: 'T2', id: '321', requestStatus: 'request' }
  ]
};

const ids = {};
order.requests.forEach((request) => {
  ids[request.id] = request.code;
});

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