Generate an array of objects using the values from a different array of objects

Question

Generate an array of objects using the values from a different array of objects

I have an array of objects:

const users = [
  { name: 'Alice' },
  { name: 'Eve' }
]

However, I want to transform it into an array like this:

const updatedUsers = [
  { key: 'Alice', value: 'Alice', text: 'Alice' },
  { key: 'Eve', value: 'Eve', text: 'Eve' }
]

Currently, I am achieving this using the following method:

const updatedUsers = []
users && users.length > 0 && users.map(user => {
  updatedUsers.push({ key: user.name, value: user.name, text: user.name })
})

Is there a simpler way to achieve this transformation without manually building each object and pushing it into a new array?

javascript arrays object

Answer 1

Answer №1

To efficiently create the array in one go, you can utilize the .map function along with Object.fromEntries on an array of entries:

const user = [
  { name: 'Bob' },
  { name: 'Frank' }
];
const result = user.map(({ name }) => Object.fromEntries(
  ['key', 'value', 'text'].map(key => [key, name])
));
console.log(result);

In case user is possibly undefined, you can substitute it with an empty array initially:

const result = (user || []).map(...

Checking for user.length beforehand is unnecessary. If the length is 0, the result will still be the empty array since there are no items to iterate over.

Answer 2

To efficiently create the array in one go, you can utilize the .map function along with Object.fromEntries on an array of entries:

const user = [
  { name: 'Bob' },
  { name: 'Frank' }
];
const result = user.map(({ name }) => Object.fromEntries(
  ['key', 'value', 'text'].map(key => [key, name])
));
console.log(result);

In case user is possibly undefined, you can substitute it with an empty array initially:

const result = (user || []).map(...

Checking for user.length beforehand is unnecessary. If the length is 0, the result will still be the empty array since there are no items to iterate over.

Answer 3

Answer №2

When utilizing the .map() method, it is important to always return the new element within the callback function. Failure to do so indicates that you should consider using .forEach() instead.

Additionally, you have the option to use destructuring in order to prevent redundancy when referencing u.name.

result = user ? user.map(({name}) => ({ key: name, value: name, text: name })) : [];

Answer 4

When utilizing the .map() method, it is important to always return the new element within the callback function. Failure to do so indicates that you should consider using .forEach() instead.

Additionally, you have the option to use destructuring in order to prevent redundancy when referencing u.name.

result = user ? user.map(({name}) => ({ key: name, value: name, text: name })) : [];

Answer 5

Answer №3

If you want to add new fields to your object, consider using the following syntax:

result["key"] = u.name

Answer 6

If you want to add new fields to your object, consider using the following syntax:

result["key"] = u.name

Answer 7

Answer №4

Consider utilizing the map() function by @barmar or the reduce() function below:

const result = user.reduce((res, u) => {
    res.push({ key: u.name, value: u.name, text: u.name }); return res
}, [])

Explore the Benefits of JavaScript's Reduce Method

Answer 8

Consider utilizing the map() function by @barmar or the reduce() function below:

const result = user.reduce((res, u) => {
    res.push({ key: u.name, value: u.name, text: u.name }); return res
}, [])

Explore the Benefits of JavaScript's Reduce Method

Generate an array of objects using the values from a different array of objects

Answer №1

Answer №2

Answer №3

Answer №4

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