Javascript - One-liner to extract values from object to array

Question

I quite simple one:

I have a Javascript object with some properties whose values are arrays, with the following structure:

let obj = {emails: ["[email protected]", "[email protected]"], nickname: ["asdf"],...}

I need to get an array of arrays with only the values, like the following:

let obj2 = [["[email protected]"], ["[email protected]"], ["asdf"],...]

With Object.values(obj), I get [["[email protected]", "[email protected]"], ["asdf"],...], which is not exactly what I am looking for, but it is a good starting point...

Also, I am looking for a one-liner to do it, if possible. Any ideas? Thanks.

Possible duplicate of Best way to flatten JS object (keys and values) to a single depth array — Obsidian Age
– Obsidian Age, Commented Apr 4, 2018 at 22:22
This is not the same, I only need the values (not the keys), and each one in a separate array... — andcl
– andcl, Commented Apr 4, 2018 at 22:53

Ele · Accepted Answer · 2018-04-04 22:40:29Z

5

An alternative using the function reduce.

This approach adds objects and arrays from the first level.

As you can see, this approach evaluates the type of the object.

let obj = {emails: ["[email protected]", "[email protected]"], nickname: ["asdf"]}

var result = Object.values(obj).reduce((a, c) => {
  if (Array.isArray(c)) return a.concat(Array.from(c, (r) => [r]));
  return a.concat([c]);
}, []);

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

One line approach (excluding the checking for array type):

let obj = {emails: ["[email protected]", "[email protected]"], nickname: ["asdf"]},
    result = Object.values(obj).reduce((a, c) => (a.concat(Array.from(c, (r) => [r]))), []);

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

edited Apr 4, 2018 at 22:40

answered Apr 4, 2018 at 22:24

Ele

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3 Comments

Pritam Banerjee Over a year ago

The output does not match the way OP wanted it.

andcl Over a year ago

Edited the question one sec ago

andcl Over a year ago

Thanks. Although the other answer was a one-liner.

Nenad Vracar · Accepted Answer · 2018-04-04 22:28:30Z

4

You can use Object.values to get array of values and then concat and spread syntax ... to get flat array and then map method.

let obj = {emails: ["[email protected]", "[email protected]"], nickname: ["asdf"]}
const values = [].concat(...Object.values(obj)).map(e => [e])
console.log(values)

edited Apr 4, 2018 at 22:28

answered Apr 4, 2018 at 22:24

Nenad Vracar

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2 Comments

andcl Over a year ago

Edited the question one sec ago

andcl Over a year ago

Works like a charm, and in one line. Thanks!

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