Question 295766 in Javascript Question posted in
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Javascript – transform a data structure from an object of arrays to an array

I have forgotten most of what I learnt so treat ma as a novice. 🙁

I have an object of arrays returned from a database select statement as below :-

options:[{"breed":"bulldog"},{"breed":"labrador"}{"breed":"beagle"},{"breed":"dobermann"}]

Using javascript, how can I transpose this into an array as below :-

const breed ["bulldog","labrador","beagle","dobermann"];

The array will be used to populate a node-red dropdown menu.

Thanks for looking or advising.

I have tried split and map, but I cant seem to arrive at my required.
Maybe because I did not code it correctly.

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2

Answers


  1. 0

    You’ll need to map() over the array, and then select the breed key of each object.

    const options = [{"breed":"bulldog"},{"breed":"labrador"},{"breed":"beagle"},{"breed":"dobermann"}];
const breeds = options.map(o => o.breed);

console.log(breeds);

    If you can’t use a hard-coded breed key, you can use Object.values() with flatMap():

    const options = [{"breed":"bulldog"},{"breed":"labrador"},{"breed":"beagle"},{"breed":"dobermann"}];
const breeds = options.flatMap(o => Object.values(o));

console.log(breeds);
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  2. 0

    Object.values is probably the best way…

    const breeds = Object.values(options);
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