Copy values from multiple keys from array of object

Question

I want to copy value of name and age into another array, below code is working fine, But I wanted to know better way to do it.

const users = [
    { id: 0, name: 'John', age:34 },
    { id: 1, name: 'Wayne', age:44 },
    { id: 2, name: 'David', age:24 },
];
let values=[];
 users && users.map(user => {
            values.push(user['name'])
            values.push(user['age'])

        })
        console.log(values);

output

['John', 34, 'Wayne', 44, 'David', 24]

with less code, in some standard way, instead of pushing, can we return — Supriya Kumari
– Supriya Kumari, Commented Nov 9, 2022 at 8:21
const values = (users) ? users.map(el => [el.name, el.age]).flat() : []; One line code, next time if you want a review of code use Code review — Simone Rossaini
– Simone Rossaini, Commented Nov 9, 2022 at 8:21
another alternative. simple and readable: const values = []; users.forEach(user => { values.push(user.name) values.push(user.age) }) — ericmp
– ericmp, Commented Nov 9, 2022 at 8:22
If your goal is to get less code, then use a minifier. Though I'd personally strive for readable and maintainable code. — Ivar
– Ivar, Commented Nov 9, 2022 at 8:25

RenaudC5 · Accepted Answer · 2022-11-09 08:22:58Z

3

You can bind each items to an array containing both its name and age and then flattern these arrays.

This can be done using Array#FlatMap

const users = [
    { id: 0, name: 'John', age:34 },
    { id: 1, name: 'Wayne', age:44 },
    { id: 2, name: 'David', age:24 },
];

const nameAndAges = users.flatMap(user => [user.name, user.age])

console.log(nameAndAges)

answered Nov 9, 2022 at 8:22

RenaudC5

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Comments

Ahmed Saleh · Accepted Answer · 2022-11-09 08:35:14Z

0

Your solution looks good, this can be also solved in different ways, I guess you may want to create function for handling this.

const users = [
    { id: 0, name: 'John', age: 34 },
    { id: 1, name: 'Wayne', age: 44 },
    { id: 2, name: 'David', age: 24 },
];

const result = mapArrayToProps(users, ['name', 'age']);

function mapArrayToProps(arr, props) {
    return arr.flatMap(obj => mapObjectToProps(obj, props));
}

function mapObjectToProps(obj, props) {
    return props.map(prop => obj[prop])
}

console.log(result);

answered Nov 9, 2022 at 8:35

Ahmed Saleh

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