I want to achieve this format. As you can see on the output there's a bracket but I want to get only the '10': ["11/21/2022", "11/25/2022"] or this one.
{
'10': ["11/21/2022", "11/25/2022"]
}
const data = [{
user_id: "10",
dates: ["11/21/2022", "11/25/2022"],
}, ];
const output = data.map(({
user_id,
dates
}) => ({
[user_id]: dates
}));
console.log(output);You can only do this if the array has just one entry. Otherwise, how would you know which array element to use?
Then just create it directly, map creates an array, not an object:
const [{ user_id, dates }] = data;
const output = {
[user_id]: dates,
};
Live Example:
const data = [
{
user_id: "10",
dates: ["11/21/2022", "11/25/2022"],
},
];
const [{ user_id, dates }] = data;
const output = {
[user_id]: dates,
};
console.log(output);Or without the initial destructuring:
const output = {
[data[0].user_id]: data[0].dates,
};
Live Example:
const data = [
{
user_id: "10",
dates: ["11/21/2022", "11/25/2022"],
},
];
const output = {
[data[0].user_id]: data[0].dates,
};
console.log(output);
data, is map needed if just picking first item, IMO OP wants { '10': ["11/21/2022", "11/25/2022"], '11': ["11/21/2022", "11/25/2022"], '12': ["11/21/2022", "11/25/2022"] } etcmap is returning array again, so if you wanna get only object you can use [0] to access it directly
sth like this :
console.log(output[0]);
or this :
const output = data.map(({
user_id,
dates
}) => ({
[user_id]: dates
}))[0];
let out = {}; for (let item of data) out[item.user_id] = item.dates; console.log(out)output[0]?