CODEWITHSUNDEEP
javascript
andcl
andcl

Reputation: 3548

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

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.

Upvotes: 4

Views: 2107

Answers (2)

Ele
Ele

Reputation: 33726

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; }

Upvotes: 5

Nenad Vracar
Nenad Vracar

Reputation: 122057

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)

Upvotes: 4

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